302 citations
Every source, in one place.
The full list of what the site rests on, case by case, reading by reading and entry by entry.
In brief
What sources does Pattern of Errors use?
Pattern of Errors cites court records, plea statements, official inquiries and agency reports first, and published second sources after them. This page lists every citation by case and by reading, and links each Reference entry to its own source list. A citation carries a link only when the page behind it has been opened and checked.
By case
No. 01 · The Myth
An IQ of 145 turned himself in.
Sources
Radford/FGCU Serial Killer Database, Kemper case file (Aamodt, 2004) — Kemper IQ 145
Prothero & Smith, ‘Defending Gary’ (Wiley, 2006), p. 150 — Ridgway IQ 85, tested for the defense by Dr. Craig Beaver
People v. Kemper, Santa Cruz County Superior Court — jury verdict Nov 8, 1973, eight counts of first-degree murder (court file not online; verdict as reported by the SFSU Bay Area Television Archive and Lookout Santa Cruz, Jul 10, 2024)
No. 02 · The Catch
The parking ticket only picked the date.
Sources
NYPD Operation Omega case history
People v. Berkowitz, Kings/Queens/Bronx County, guilty plea May 1978
No. 03 · The Myth
An IQ of 85 stayed free for nineteen years.
Sources
State v. Ridgway, King County Superior Court — plea statement, Nov 5, 2003
Prothero & Smith, ‘Defending Gary’ (Wiley, 2006), p. 150 — Ridgway IQ 85, tested for the defense by Dr. Craig Beaver (his defense lawyer’s account)
No. 04 · The Myth
The FBI retired the myth that serial killers can’t stop in 2008.
Sources
FBI, ‘Serial Murder: Multi-Disciplinary Perspectives for Investigators’ (2008; 2005 symposium) — myth: ‘serial killers cannot stop killing’; some stop as family involvement and other diversions take over
People v. DeAngelo, Sacramento County Superior Court, plea June 2020, sentence Aug 2020
No. 05 · The Catch
A criminology PhD student left his DNA at the scene.
Sources
State of Idaho v. Kohberger — probable cause affidavit (unsealed Jan 2023); plea Jul 2, 2025; sentence Jul 23, 2025 (Ada County)
State’s filing, Mar 2025 — Amazon order, Mar 2022: knife, sheath, sharpener (CBS News)
No. 06 · The Pyramid
Every step up this pyramid removes one way to get caught.
Sources
Wisconsin v. Dahmer (1992)
State v. Ridgway, King County (2003)
FBI statements on Israel Keyes (2012–13) — confessed in custody; died Dec 2, 2012, before trial
SFPD / Vallejo PD: Zodiac case open
No. 07 · The Failure
Gacy and Zodiac are opposites, and that explains both.
Sources
People v. Gacy, Cook County, 1980 (33 counts); Illinois Supreme Court, 1984
SFPD / Vallejo PD / Napa & Solano County Sheriffs — Zodiac case status: open
No. 08 · The Class
Concealment decides how long. Biology decides whether.
Sources
FBI press release, Oct 6, 2019 — 93 confessions, 50 confirmed; ‘most prolific serial killer in U.S. history’
Texas DPS, ‘New Details Released in Unsolved Samuel Little Murders’, Dec 1, 2021 — more than 60 of his 93 confessions matched to victims by DNA or corroborated interviews
People v. Little, Los Angeles County Superior Court, 2014 (3 counts)
No. 09 · The Failure
A doctor’s signature made every death natural.
Sources
The Shipman Inquiry (Dame Janet Smith) — First Report 2002: 215 killings, 1975–98; Sixth Report 2005: about 250 deaths, 1971–98, 218 identified
R v Shipman, Preston Crown Court, Jan 2000 (15 murders + forgery)
No. 10 · The Failure
The state executed a man it later cleared, then released a killer.
Sources
Supreme Court of the Russian Federation, criminal panel — cassation ruling, Jun 30, 1993: amended the Rostov verdict of Oct 14, 1992, found the Zakotnova count and several others unproven, upheld the death sentence
Lenta.ru, Nov 22, 2020 — trial records from the archives: acquitted on appeal of eight murders, including Yelena Zakotnova’s
Aleksandr Kravchenko — executed Jul 5, 1983; conviction annulled by the Supreme Court in 1991 (Komsomolskaya Pravda; Diletant)
Robert Cullen, ‘The Killer Department’ (1993) — investigation history
By reading
Sources
Gacy v. Welborn, 994 F.2d 305 (7th Cir., decided Apr. 12, 1993), opinion of Circuit Judge Easterbrook (Public.Resource.Org): the murders of 1972 to 1978; Robert Piest’s disappearance on December 11, 1978; the conviction of March 1980 on 33 counts; death sentences on 12; the Illinois Supreme Court’s affirmance
Janet Shedd, “Supreme Court upholds Gacy death sentence” (United Press International, June 6, 1984), UPI Archives, archived copy: the Illinois Supreme Court’s ruling of June 6, 1984; trial testimony dating the murders from January 3, 1972 to December 11, 1978; 33 young men and boys
Nichole Manna, “John Wayne Gacy’s Capture Happened Because of a Missing Teen Case” (A&E, published Oct. 15, 2025; last updated July 16, 2026): police questioning in 1976 about Gregory Godzik; the Chicago arrest on a kidnapping and rape complaint that was not prosecuted; the 1968 Iowa conviction; five victims unidentified
Biography.com Editors, Colin McEvoy and Catherine Caruso, “John Wayne Gacy” (Biography.com, updated Oct. 16, 2025): police questioning about disappearances by the mid-1970s; John Butkovich and Gregory Godzik as employees; the Butkovich family’s calls to police; the arrest of 1971; the first known murder in January 1972; the complaint police did not pursue
Federal Bureau of Investigation, “The Zodiac Killer” (FBI.gov story, Mar. 2, 2007; date from the page address), FBI archives, archived copy: five murders in the Bay Area in 1968 and 1969; the offender’s identity unknown; no federal jurisdiction
Michael Butterfield, “The Zodiac Killer: A Timeline” (History.com, published Nov. 8, 2017; last updated May 28, 2025): the four attacks, their dates and places, and the victims’ names; the official count of five murders
Associated Press, “Timeline of Serial Killer John Wayne Gacy’s Life, Case” (as published by NBC Chicago, Oct. 26, 2021): the conviction of March 1980; the execution on May 10, 1994
People v. Gacy, 103 Ill. 2d 1, 468 N.E.2d 1171 (Illinois Supreme Court, No. 53212, opinion filed June 6, 1984) (Harvard Law School Library, Caselaw Access Project): Robert Piest’s disappearance on December 11, 1978; the missing-person report; the Iowa conviction; the search warrants of December 13 and December 21, 1978; the earlier arrest on a kidnapping and deviate sexual assault complaint; 29 victims recovered at the house; death sentences on 12 counts
Mitch Dudek, “Where John Wayne Gacy buried the bodies, more; key sites tied to serial killer” (Chicago Sun-Times, Dec. 14, 2018; date from the article address): the arrest on December 21, 1978; the first search on December 13, 1978; 29 of the 33 victims found on his property
Cook County Sheriff’s Office, “Unidentified Victims John Wayne Gacy” (official web page, undated; read Oct. 8 and Oct. 9, 2026): five victims still unidentified; DNA profiles from all five; some victims never reported missing
“John Wayne Gacy” (Encyclopaedia Britannica, online entry), archived copy of June 29, 2026: the 1968 Iowa plea and 10-year sentence; parole in 1970; the arrests of 1971; the arrest on December 21, 1978; the execution on May 10, 1994
Gina Tron, “Why Was Robert Piest’s Disappearance Treated More Seriously Than John Wayne Gacy’s Other Victims?” (Oxygen, Apr. 1, 2021): John Butkovich, an employee, vanished in 1975; Gregory Godzik, an employee, vanished in 1976, and Gacy claimed he had run away
“Victims’ kin applaud Gacy death sentence” (United Press International, Mar. 14, 1980), UPI Archives, archived copy: Gregory Godzik, 17, who disappeared in 1976
Whet Moser, “John Wayne Gacy, Runaways, and the Decline of the Serial Killer” (Chicago Magazine, Oct. 18, 2011, now hosted by the Chicago Tribune), quoting Eileen Ogintz, “Missing boy’s family always feared Gacy” (Chicago Tribune, Dec. 25, 1978): John Butkovich’s disappearance in 1975 and his parents’ calls to Chicago police
CNN, “John Wayne Gacy victims remembered on 40th anniversary of arrest” (as published by ABC7 Chicago, Dec. 21, 2018): the Piest family’s call to police that night; the Iowa plea and 10-year sentence found in a police background check; the search warrant the day after police first visited the house
Kerana Todorov, “Zodiac killer case investigator dies of cancer” (Napa Valley Register, Dec. 2, 2010): a Napa County Sheriff’s detective investigated the Lake Berryessa stabbings of September 1969; slayings in Benicia, Vallejo and San Francisco between December 1968 and October 1969; no one ever arrested; the case open
Associated Press, “DNA Match Sought to Catch Zodiac Killer After Break in Other Case” (as published by KQED, May 4, 2018): Vallejo police sent two of the letters to a private lab for DNA testing
Kiki Intarasuwan and Jodi Hernandez, “Investigators Renew Hope in Finding Zodiac Killer With DNA: Report” (NBC Bay Area, May 3, 2018): Vallejo police sent two envelopes holding letters for DNA analysis; Darlene Ferrin shot in Vallejo on July 4, 1969
Associated Press, “Zodiac cipher solved 51 years after it was sent to San Francisco Chronicle” (as published by the Napa Valley Register, Dec. 11, 2020): the FBI San Francisco statement of December 11, 2020
Leah Asmelash and Cheri Mossburg, “After 51 years, the Zodiac Killer’s cipher has been solved by amateur codebreakers” (CNN, Dec. 11, 2020): five unsolved murders; the offender never caught; letters to police and media; the FBI statement of December 11, 2020
San Francisco State University, J. Paul Leonard Library, Bay Area Television Archive, “Double Murder of Faraday & Jensen (Zodiac)”, catalog record for KRON newsfilm 420-1, film date Dec. 21, 1968: the attack of December 20, 1968 on Lake Herman Road
San Francisco State University, J. Paul Leonard Library, Bay Area Television Archive, “Zodiac Killer Letters: KRON-TV Compilation (1969-70)”, catalog record for KRON newsfilm 2366-15: Paul Stine killed in San Francisco on October 11
Sources
Michael Butterfield, “The Zodiac Killer: A Timeline” (History.com, published Nov. 8, 2017; last updated May 28, 2025): the four attacks, their dates, places and weapons, and the victims’ names; the official count of five murders
Kerana Todorov, “Zodiac killer case investigator dies of cancer” (Napa Valley Register, Dec. 2, 2010): a Napa County Sheriff’s detective investigated the Lake Berryessa stabbings of September 1969; slayings in Benicia, Vallejo and San Francisco between December 1968 and October 1969; no one ever arrested; the case open
Victor Lindsey, “David Berkowitz” (EBSCO Research Starters, biography, 2013): eight attacks with a .44-caliber revolver in New York City, July 29, 1976 to July 31, 1977; the six people killed; the arrest on August 10, 1977 outside his apartment building in Yonkers
CBS News, “‘Son of Sam’: A serial killer’s reign of terror” (48 Hours photo timeline, July 30, 2025): six killed and seven wounded; the date, place and circumstances of each of the eight attacks; all in the Bronx, Brooklyn and Queens; hundreds of police in the manhunt; the arrest and the plea
Mary Murphy, “Son of Sam, 40 years later: A PIX11 digital documentary on killer’s arrest and a scary time in New York” (PIX11, WPIX-TV, Aug. 10, 2017): the March 1977 announcement that one .44-caliber handgun was behind the attacks; one task force of about 300 detectives; attacks on young people in cars
HISTORY.com Editors, “Son of Sam serial killer is arrested” (History.com, published Feb. 9, 2010; last updated Nov. 7, 2025): each of the eight attacks; the bullet match after the shooting of March 8, 1977; the task force; the Yonkers police investigation; the witness and the parking tickets; the arrest and the plea
People v. Berkowitz, 97 Misc. 2d 277 (N.Y. Sup. Ct., Criminal Term, Kings County, Dec. 4, 1978), opinion of Justice Joseph R. Corso (Harvard Law School Library, Caselaw Access Project): homicide indictments based on events in Kings, Queens and Bronx Counties; the guilty plea of May 8, 1978 and the sentence of June 12, 1978
“The ‘Son of Sam’ Trial: 1978”, Great American Trials (Gale), via Encyclopedia.com (undated; opened Oct. 8 and Oct. 9, 2026): hundreds of detectives assigned; the parking ticket at a fire hydrant near the eighth attack; the three judges; the sentence of June 12, 1978
Lee Lescaze, “Berkowitz Given Maximum Sentences in 6 ‘Son of Sam’ Murders” (The Washington Post, June 13, 1978), archived copy: maximum sentences of 25 years to life for each of the six murders, imposed by three judges; six dead and seven wounded
Biography.com Editors and Colin Bertram, “The Son of Sam Struck Fear Into New York City. Here’s How the Case Unfolded” (Biography.com, July 28, 2025): the press conference two days after the shooting of March 8, 1977; the eyewitness and the parking tickets; the earlier investigation over a neighbor’s complaints
Federal Bureau of Investigation, “The Zodiac Killer” (FBI.gov story, Mar. 2, 2007; date from the page address), FBI archives, archived copy: five murders in the Bay Area in 1968 and 1969; no federal jurisdiction; the FBI’s support to local agencies
San Francisco State University, J. Paul Leonard Library, Bay Area Television Archive, “Double Murder of Faraday & Jensen (Zodiac)”, catalog record for KRON newsfilm 420-1, film date Dec. 21, 1968: the attack of December 20, 1968 on Lake Herman Road and the Solano County Sheriff’s detective on the case
San Francisco State University, J. Paul Leonard Library, Bay Area Television Archive, “Zodiac Killer Letters: KRON-TV Compilation (1969-70)”, catalog record for KRON newsfilm 2366-15: Paul Stine killed in San Francisco on October 11; San Francisco’s police chief on the letter that held part of his shirt
“Stepped up search for killer” (United Press International, Dec. 23, 1968), UPI Archives, archived copy: the Solano County Sheriff’s office on the first attack, off Lake Herman Road near Benicia
Kiki Intarasuwan and Jodi Hernandez, “Investigators Renew Hope in Finding Zodiac Killer With DNA: Report” (NBC Bay Area, May 3, 2018): Vallejo police sent two envelopes holding letters for DNA analysis; Darlene Ferrin shot in Vallejo on July 4, 1969
Associated Press, “DNA Match Sought to Catch Zodiac Killer After Break in Other Case” (as published by KQED, May 4, 2018): Vallejo police as lead investigators; two of the letters sent to a private lab for DNA testing; five people stabbed or shot
San Francisco State University, J. Paul Leonard Library, Bay Area Television Archive, “Zodiac Killer: Lake Berryessa Attack”, catalog record for KPIX newsfilm 100312, film date Sept. 30, 1969: the Napa County Sheriff’s office on the third attack
San Francisco State University, J. Paul Leonard Library, Bay Area Television Archive, “Captain Lee on Zodiac Case Cooperation”, catalog record for KRON newsfilm 2133-7, film date Oct. 20, 1969: a San Francisco police captain on the case
Associated Press, “Zodiac cipher solved 51 years after it was sent to San Francisco Chronicle” (as published by the Napa Valley Register, Dec. 11, 2020): the FBI San Francisco statement of December 11, 2020; captions on the weapons used
Leah Asmelash and Cheri Mossburg, “After 51 years, the Zodiac Killer’s cipher has been solved by amateur codebreakers” (CNN, Dec. 11, 2020): the offender never caught; the FBI statement of December 11, 2020
Federal Bureau of Investigation, Behavioral Analysis Unit-2, National Center for the Analysis of Violent Crime, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (FBI, 2008; report of the symposium of Aug. 29 to Sept. 2, 2005), archived copy of the FBI.gov page “Serial Murder”; year of publication per the Office of Justice Programs library record, NCJ 223848: the myth that serial killers cannot stop
Sources
The Seattle Times, “Timeline: DNA testing helped lead investigators to Green River killer” (Nov 6, 2003): samples 1987, new DNA method 2001, arrest, plea
Ian Ith, Steve Miletich and Duff Wilson, “Detectives’ case hinges on 14-year-old saliva sample in Green River arrest” (The Seattle Times, Dec 1, 2001): the 1987 gauze sample and why it waited
King County Sheriff’s Office, “Green River homicides investigation” (King County, Washington, undated web page): charges 2001, guilty plea 2003
HistoryLink Staff, “Police arrest Green River Killer suspect on November 30, 2001” (HistoryLink.org, Essay 3648, Dec 2, 2001): arrest date and DNA link
FBI Laboratory, “CODIS” (FBI, web page, archived Jan 2026): what CODIS does and when it began
U.S. Department of Justice, Office of the Inspector General, “Combined DNA Index System Operational and Laboratory Vulnerabilities,” Audit Report 06-32, Introduction (May 2006): CODIS history, levels and indexes
34 U.S.C. § 12592, “Index to facilitate law enforcement exchange of DNA identification information” (Pub. L. 103-322, Sept 13, 1994, as amended; Office of the Law Revision Counsel): what the national index may hold
U.S. Department of Justice, “Interim Policy: Forensic Genetic Genealogical DNA Analysis and Searching” (approved Sept 2, 2019; effective Nov 1, 2019): how a CODIS search produces a lead, and the case criteria for genealogy
FBI, “FBI Confirms Samuel Little is Most Prolific Serial Killer in U.S. History” (press release, Oct 6, 2019): 2012 arrest, DNA link, 2014 conviction, ViCAP review
Associated Press, “Expert: DNA evidence links suspect to strangling in Los Angeles in 1980s” (Fox News, Aug 19, 2014): the database link and the three victims
Associated Press, “Career criminal gets life for 3 1980s US killings” (CBS News, Sept 25, 2014): verdict and sentence
Doha Madani, “FBI confirms Samuel Little’s confession: He is the worst serial killer in U.S. history” (NBC News, Oct 7, 2019): 2012 arrest, DNA tie, FBI count
Los Angeles Police Department, “Man Linked to Three Cold Case Murders,” news release NR13009cj (LAPD Online, Jan 7, 2013): the CODIS offender databank link, the Kentucky arrest, the third case
KOMO Staff & News Services, “Timeline of Green River Killings” (KOMO News, Aug 31, 2006): the 1987 search and samples, the 2001 testing, the 2001 charges
Sources
U.S. Department of Justice, “Interim Policy: Forensic Genetic Genealogical DNA Analysis and Searching” (approved Sept 2, 2019; effective Nov 1, 2019): definitions, scope, case criteria, limits
Yaniv Erlich, Tal Shor, Itsik Pe’er and Shai Carmi, “Identity inference of genomic data using long-range familial searches,” Science 362(6415):690-694 (2018), doi:10.1126/science.aau4832 (Europe PMC record): the 60 percent projection
Malcolm Ritter, Associated Press, “DNA Websites Cast Broad Net for Identifying People, Study Says” (NBC Washington, Oct 11, 2018): the study’s findings in plain terms; the April 2018 announcement
Orange County District Attorney, “Joseph James DeAngelo Jr. Pleads Guilty to 13 Murders, 13 Kidnappings and Dozens of Additional Uncharged Crimes” (press release, June 29, 2020): plea, IGG identification, victim list
Janelle Griffith, “Golden State Killer suspect pleads guilty to 13 counts of first-degree murder” (NBC News, June 29, 2020): plea, April 2018 arrest, discarded DNA
Orange County District Attorney, “Joseph James DeAngelo Jr. Sentenced to 11 Consecutive Life terms without the Possibility of Parole for 13 Murders, and an additional consecutive Life term for 13 Kidnappings” (press release, Aug 21, 2020): sentence, victim list
Rebecca Robbins, STAT, “The Golden State Killer Case Was Cracked with a Genealogy Web Site” (Scientific American reprint, Apr 28, 2018; first published Apr 26, 2018): how the search ran
ABC News, “’Golden State Killer’ victim’s sister: ‘I can finally breathe again’” (Apr 26, 2018): Janelle Cruz, Irvine, 1986; arrest in Citrus Heights; discarded DNA
District Court of the Second Judicial District, Latah County, State of Idaho v. Bryan C. Kohberger, No. CR29-22-2805, “Order Addressing IGG DNA and Order for In Camera Review” (Oct 25, 2023), quoting the State’s Motion for Protective Order and the probable-cause affidavit: the genealogy tip, the STR confirmation, the warrants
State of Idaho v. Bryan C. Kohberger, No. CR01-24-31665, State’s Response to Defendant’s Motion in Limine #9 (Ada County, filed Mar 17, 2025), State’s Exhibit S-1: probable-cause affidavit, Statement of Brett Payne
Julianne McShane, “Genetic genealogy was used to link Bryan Kohberger, suspect in Idaho slayings, to crime scene, prosecutors say” (NBC News, June 21, 2023): the June 16, 2023 prosecution filing
Kerry Breen, “Bryan Kohberger pleads guilty to murdering 4 University of Idaho students in 2022” (CBS News, July 2, 2025): the plea
Ada County District Court, “Case Summary, Case No. CR01-24-31665, State of Idaho vs. Bryan C Kohberger” (printed July 9, 2026): amended plea July 2, 2025; judgment July 23, 2025
Elisha Fieldstadt, “Golden State Killer Joseph DeAngelo sentenced to life without possibility of parole” (NBC News, Aug 21, 2020): the sentence
Michael Ruiz, Fox News Digital, “Idaho judge gives Bryan Kohberger win over genetic genealogy battle” (FOX 13 Seattle, Oct 31, 2023): the October 2023 order on the genealogy evidence
Elisabeth Ford, “Cheek Swab of Idaho Murder Suspect Bryan Kohberger Directly Links His DNA to Found Knife Sheath, Prosecutors Say” (Oxygen, June 21, 2023): the June 16, 2023 motion for a protective order
Sources
HISTORY.com Editors, “Son of Sam serial killer is arrested” (History, This Day in History, published Feb 9, 2010, updated Nov 7, 2025): the toll, the March 1977 bullet match, the witness and the tickets, the plea and sentences
Colleen Long, Associated Press, “’Son of Sam’ killer was arrested 40 years ago this week” (KSL.com, Aug 9, 2017): the toll, Donna Lauria, the March 1977 ballistics link, the ticket check, the arrest
CBS New York, “Remembering The ‘Son Of Sam’ Case 40 Years After Serial Killer’s Arrest” (CBS News, Aug 10, 2017): the toll, Stacy Moskowitz, the ticket, 25 years to life for each murder
The Shipman Inquiry (Dame Janet Smith), First Report, Volume One, “Death Disguised” (July 19, 2002; UK Government Web Archive copy via archive.org): Mrs Grundy’s death, the will, the investigation, the 215 finding
The Shipman Inquiry (Dame Janet Smith), Second Report, “The Police Investigation of March 1998” (Cm 5853, July 2003): the earlier police check ended April 17, 1998; three more patients killed after it
Gosport Independent Panel, “The Panel Report” (June 20, 2018), Part I, Chapter 1, “Unheeded warnings, the nurses’ concerns and their context,” paras 1.41 to 1.42: Shipman’s arrest and conviction
David Wallen, “Doctor is Britain’s worst serial killer” (The Globe and Mail, Feb 1, 2000): Kathleen Grundy’s age; the forged will alerted the police
Mark Hansen, “How the Cops Caught BTK” (ABA Journal, May 1, 2006): the disk question and the newspaper ad, the file’s properties, the arrest, the plea
Associated Press, “Computer Trail Led To BTK Suspect” (CBS News, Mar 4, 2005): the disk traced to Christ Lutheran Church, the arrest
Daniel Schorn, “BTK: Out Of The Shadows” (CBS News, 48 Hours, Sept 29, 2005): the disk question, the newspaper ad, the disk traced to a church and a user named Dennis
Greg Allen, “Victims’ Families Reject Kansas Killer’s Apology” (NPR, Aug 19, 2005): the sentence, the plea, the last victim
KWCH, “Today marks 20 years since ‘BTK’ serial killer sentenced to life in prison” (KWCH 12, Aug 18, 2025): the sentencing date, the first victims, the arrest
State of Idaho v. Bryan C. Kohberger, No. CR01-24-31665, “State’s Response to Defendant’s Motion in Limine #9 RE: Excluding Amazon Click Activity Evidence at Trial” (Ada County, filed Mar 17, 2025): the order records and the warrant
Audrey McAvoy, Associated Press, “Prosecutors say University of Idaho suspect bought knife on Amazon months before stabbings” (KOMO News, Mar 20, 2025): the filing in plain terms
Ada County District Court, “Case Summary, Case No. CR01-24-31665, State of Idaho vs. Bryan C Kohberger” (printed July 9, 2026): amended plea July 2, 2025; jury trial set for Aug 18, 2025, vacated
Kerry Breen, “Bryan Kohberger pleads guilty to murdering 4 University of Idaho students in 2022” (CBS News, July 2, 2025): the plea to four counts of first-degree murder and one of burglary; trial expected in August
Sources
Supreme Court of Illinois, People v. Gacy, 103 Ill. 2d 1, 468 N.E.2d 1171, No. 53212 (opinion filed June 6, 1984; Justia copy via archive.org): the disappearance, the missing-person report, the warrants, the receipt, the convictions
NBC Chicago, “40 Years Later: Secrets of the John Wayne Gacy Case” (Dec 20, 2018): Piest as the last victim, the surveillance, the Dec 21 arrest
HISTORY.com Editors, “Cannibal and serial killer Jeffrey Dahmer is caught” (HISTORY, This Day in History entry for July 22, 1991; published Nov 13, 2009, updated July 21, 2025): the escape, the return to the apartment, the verdict, the sentence
Grand Forks Herald staff, “Today in History: July 24, 1991 - Body parts found in apartment” (Grand Forks Herald, July 24, 2025): reprints the paper’s July 24, 1991 front-page report of the escape and the arrest
HISTORY.com Editors, “Son of Sam serial killer is arrested” (HISTORY, This Day in History entry for Aug 10, 1977; published Feb 9, 2010, updated Nov 7, 2025): the witness, the sketch, the tickets, the arrest
Colleen Long, Associated Press, “’Son of Sam’ killer was arrested 40 years ago this week” (KSL.com, Aug 9, 2017): the witness, the tickets, the arrest
CBS New York, “Remembering The ‘Son Of Sam’ Case 40 Years After Serial Killer’s Arrest” (CBS News, Aug 10, 2017): Stacy Moskowitz, the last shooting on July 31, 1977, the arrest 10 days later
FBI, “Samuel Little: Confessions of a Killer” (FBI news story, Oct 6, 2019; archive.org copy of Jan 2, 2026): how his victims’ deaths were recorded
Doha Madani, “FBI confirms Samuel Little’s confession: He is the worst serial killer in U.S. history” (NBC News, Oct 7, 2019): victims who went unidentified, deaths not investigated, according to the FBI
United Press International, “Supreme Court upholds Gacy death sentence” (UPI Archives, June 6, 1984; archive.org copy of Dec 6, 2025): the 33 convictions, Robert Piest as the last victim, the affirmance
Chicago magazine, “29. John Wayne Gacy is Arrested,” in “50 Moments That Shaped Chicago 1970–2020” (Dec 1, 2020; archive.org copy of Jan 23, 2026): the arrest date
Howard Chua-Eoan, “Jeffrey Dahmer, 1991,” in “Crimes of the Century” (TIME, Mar 1, 2007): the arrest date
United Press International, “Jury finds Dahmer sane” (UPI Archives, Feb 15, 1992; archive.org copy of Aug 19, 2019): the plea and the verdict
CBS News, “Feb. 17th, 1992: Serial killer Jeffrey Dahmer sentenced” (On This Day, Feb 17, 2016): the sentence and the 15 men and boys
U.S. Court of Appeals for the Seventh Circuit, opinion in No. 98-1602, 163 F.3d 993 (argued Nov 2, decided Dec 15, 1998; law.resource.org copy): the May 27, 1991 encounter, the firing, the 1994 state-court ruling
Sources
“Serial Murder Investigation,” in L. E. Sullivan, M. S. Rosen, D. M. Schulz and M. R. Haberfeld (eds.), Encyclopedia of Law Enforcement (SAGE Publications; online edition dated Sep 15, 2007), DOI 10.4135/9781412952415.n176. Supports: linkage blindness as agencies not sharing information on unsolved murders.
S. A. Egger, “A Working Definition of Serial Murder and the Reduction of Linkage Blindness,” Journal of Police Science and Administration 12(3), September 1984, pp. 348-357. Abstract record NCJ 95075, NCJRS Virtual Library (U.S. Department of Justice, Office of Justice Programs), archived copy of Nov 12, 2025. Supports: author, title, journal and date of the article.
FBI, “ViCAP Goes Online” (FBI news story, Aug 4, 2008; FBI archives, archived copy of Jan 30, 2026). Supports: ViCAP operating in 1985.
S. A. Egger, “Serial Murder: An Elusive Phenomenon” (Praeger Publishers, 1990). Abstract record NCJ 123588, NCJRS Virtual Library (U.S. Department of Justice, Office of Justice Programs), archived copy of Dec 6, 2025. Supports: the definition of linkage blindness.
Illinois Center for the Book (Illinois State Library), Illinois Authors, individual author record for Steven A. Egger (undated). Supports: Egger is a criminologist and a specialist in serial homicide.
Vinicius Lima and Umit Karabiyik (Purdue University), “Advancing Crime Linkage Analysis with Machine Learning: A Comprehensive Review and Framework for Data-Driven Approaches,” arXiv:2411.00864v1 (Oct 30, 2024), preprint, not peer reviewed. Its references [21] and [22] are Steven A. Egger’s 1984 article. Supports: a 2024 review by two Purdue researchers cites Egger (1984) for the term; ViCAP dates to 1985.
Ryan Ocenada and Kevin Fagan, “Zodiac Killer: Why sleuths are still obsessed with S.F.’s most notorious serial killer” (San Francisco Chronicle, Oct 22, 2023). Supports: four confirmed attacks, five killed, two survived.
CBS San Francisco / Associated Press, “Zodiac Killer’s Cipher Solved By Amateur Codebreakers” (Dec 11, 2020). Supports: five killed between December 1968 and October 1969; the FBI San Francisco office’s statement that the case remains an ongoing investigation; Vallejo, Napa County and Solano County open case files, as well as the California Department of Justice.
Bay Area Television Archive, San Francisco State University, “Double Murder of Faraday & Jensen (Zodiac),” catalogue entry for KRON-TV newsfilm aired Dec 21, 1968. Supports: the Solano County Sheriff’s Department investigated the first attack.
Katie Dowd, “Will DNA submitted to genealogy sites also finally catch the Zodiac Killer?” (San Francisco Chronicle, May 1, 2018; updated Feb 19, 2019), photo-gallery caption. Supports: Vallejo police received the call claiming the second attack.
Marsha Dorgan, “Tracking the mark of the Zodiac for decades” (Napa Valley Register, Feb 18, 2007). Supports: dates and places of the attacks; Lake Berryessa in Napa County; Cecelia Shepard died two days later; a Napa County Sheriff’s investigator began work on Sep 27, 1969; never caught.
Bay Area Television Archive, San Francisco State University, “Zodiac Killer: Lake Berryessa Attack,” catalogue entry for a KPIX report of Sep 30, 1969. Supports: the third attack was in Napa County and the Napa County Sheriff’s office spoke for the investigation.
Anita Chabria and Ryan Sabalow, “Can DNA identify the Zodiac Killer now that it has revealed the East Area Rapist suspect?” (The Sacramento Bee, May 2, 2018, as carried by the Napa Valley Register). Supports: seven victims, five killed, two survivors; the 2018 statements of a former San Francisco homicide detective and a Napa County Sheriff’s lieutenant.
Bay Area Television Archive, San Francisco State University, “Captain Lee on Zodiac Case Cooperation,” catalogue entry for KRON-TV newsfilm aired Oct 20, 1969. Supports: the Oct 20, 1969 press conference on sharing information.
Dan Noyes and Kayla Galloway, “Zodiac Killer’s ‘340 Cipher’ sent to SF Chronicle 51 years ago reportedly solved by code experts” (ABC7 News, KGO-TV San Francisco, Dec 12, 2020), reporting the FBI’s statement to the station. Supports: the FBI describes the case as an ongoing investigation.
FBI, “ViCAP: Fighting Violent Crime for 25 Years” (FBI news story, Aug 26, 2010; FBI archives, archived copy of Jan 30, 2026). Supports: the FBI’s statement of the problem.
T. Christian Miller, “The FBI Built a Database That Can Catch Rapists - Almost Nobody Uses It” (ProPublica, co-published with The Atlantic, Jul 30, 2015). Supports: participation in ViCAP as of 2015.
Michael R. Sisak, “NYPD commander who took ‘Son of Sam’ confession dies at 99” (Associated Press, Sep 20, 2019, as carried by the Las Vegas Sun). Supports: one department; six killed, seven wounded, 1976 and 1977.
History.com, “Son of Sam serial killer is arrested” (A&E Television Networks, published Feb 9, 2010; updated Nov 7, 2025). Supports: the arrest on Aug 10, 1977; six killed and seven wounded.
FBI Records: The Vault, “The Zodiac Killer,” listing of released FBI records, Parts 01 to 07 (archived copy of Mar 13, 2026). Supports: the FBI has published its file on the case in seven parts.
John Philip Jenkins, “David Berkowitz” (Encyclopaedia Britannica, last updated Dec 2, 2025; archived copy of Jan 9, 2026). Supports: the arrest on Aug 10, 1977; detectives sorting through reports of suspicious persons; the guilty plea on May 8, 1978.
Sources
Seattle Times staff, “Timeline of the Green River killer case” (The Seattle Times, Feb 18, 2011). Supports: Marie Malvar’s disappearance and the truck, the 1984 polygraph, the April 8, 1987 search and samples, the March 2001 DNA testing, the 2001 arrest, the 2003 and 2011 guilty pleas.
Peter Conradi, “Murder on the Don” (The Moscow Times, Oct 9, 1992). Supports: the September 1984 detention in Rostov, the release after a blood-group result appeared to rule him out, the error found after the 1990 arrest, almost six years free.
The Shipman Inquiry (Chairman: Dame Janet Smith DBE), Second Report, “The Police Investigation of March 1998,” Cm 5853 (July 2003), official copy on gov.uk, Summary and Chapter One. Supports: the dates and findings on the March to April 1998 police investigation, the three patients killed after it, the arrest and conviction.
Norm Maleng, King County Prosecuting Attorney, “Prosecutor’s Summary of the Evidence,” State of Washington v. Gary Leon Ridgway, No. 01-1-10270-9 SEA, Superior Court of Washington for King County (undated; it records events through October 2003), copy hosted by The Seattle Times, archived Feb 17, 2006, pp. 6, 34–35, 85, 97, 117. Supports: the polygraph and what prosecutors concluded about it, the Malvar case, the 1987 search, the arrest, the 1990 and 1998 counts.
History.com, “Green River serial killer pleads guilty to 49th murder” (A&E Television Networks, published Apr 28, 2011; updated May 27, 2025). Supports: the 1984 polygraph, the 2001 arrest after DNA evidence, the 2003 plea to 48 murders and the 2011 plea to a 49th, the press name.
Igor Nadezhdin, “How Chikatilo was tried: the trial in documents from the archives” (Lenta.ru, Nov 22, 2020; updated May 10, 2021), in Russian, title translated and shortened; the headline opens with a quotation of the defendant, omitted here. Based on archive trial records. Supports: the September 1984 detention report, the theft conviction, the stopped check, the group II entry found to be a technical error (August 1991 commission), the November 20, 1990 arrest, the partial annulment and the upheld death sentence.
Kommersant (Kommersant-Rostov), “Extremely careful” (Mar 21, 2025), in Russian, title translated; an article on the Chikatilo investigation. Supports: the 1984 detention and release after a wrong blood-group result, investigators’ conclusion that the killer’s group was IV, the November 20, 1990 arrest, Svetlana Korostik killed on November 6, 1990, 43 proven murders.
Robert Seely, “Court Convicts ‘Rostov Ripper’” (The Moscow Times, Oct 15, 1992). The article misprints the defendant’s first name. Supports: the October 1992 verdict on 52 murders of women and children.
The National Archives (UK), catalogue description of series JA 10, “Independent Inquiry into the issues arising from the case of Dr Harold Shipman (The Shipman Inquiry): Official Archived Website,” administrative background. Supports: a general practitioner in Hyde, near Manchester; the conviction of January 31, 2000.
gov.uk, “The Shipman Inquiry second report: the police investigation of March 1998,” publication page, Cm 5853 (published Jul 14, 2003). Supports: the March to April 1998 investigation, five months before the arrest; the medical adviser’s review; the report’s conclusion on the three lives.
Gazeta.Ru, article marking 35 years since Chikatilo’s arrest (Nov 20, 2025), in Russian; the headline quotes the defendant and is omitted here. Supports: the September 1984 detention, the knife and rope, the technical error that recorded group II instead of group IV, the theft conviction, no further check, the Supreme Court’s exclusion of nine murder counts, at least 43 proven murders.
Reuters, “Serial killer sentenced to die in Russia” (Deseret News, Oct 15, 1992). Supports: the death sentence for 52 murders.
The Seattle Times, “Timeline: DNA testing helped lead investigators to Green River killer” (Nov 6, 2003). Supports: Marie Malvar, 18, disappeared on April 30, 1983; the November 30, 2001 arrest; Marta Reeves killed in 1990 and Patricia Yellow Robe found dead on August 6, 1998, both among the counts of the 2003 plea.
Sources
The Shipman Inquiry (Chairman: Dame Janet Smith DBE), Third Report, “Death Certification and the Investigation of Deaths by Coroners,” Cm 5854 (July 2003), official copy on gov.uk: Foreword; Summary paras 12 to 14, 19, 26, 40 and 50; paras 3.123, 5.63, 5.64, 12.32, 15.9 and 19.1 to 19.4. Supports: how death and cremation certification worked, how Shipman used it, and the Inquiry’s conclusions.
The Shipman Inquiry (Chairman: Dame Janet Smith DBE), Second Report, “The Police Investigation of March 1998,” Cm 5853 (July 2003), official copy on gov.uk: Summary paras 1 to 4 and 13; paras 1.1 to 1.3. Supports: the March 1998 police investigation and its closure, the three patients killed after it, the forged will, the exhumation and arrest, the conviction, the count of 215 and the 31 certified deaths.
The National Archives (UK), catalogue description of series JA 10, “Independent Inquiry into the issues arising from the case of Dr Harold Shipman (The Shipman Inquiry): Official Archived Website,” administrative background. Supports: the conviction on Jan 31, 2000; the Inquiry’s chair and terms of reference; the First Report (Jul 19, 2002); the Sixth Report (Jan 27, 2005) and its figures of about 250 and 218.
The Irish Times, “Shipman killed 15 as a student doctor - report” (Press Association report, Jan 27, 2005), quoting the Sixth Report. Supports: the final estimate of about 250 patients killed between 1971 and 1998.
Mark Drakeford MS, Cabinet Secretary for Health and Social Care, “Written Statement: Coming into Force of the Death Certification and Medical Examiner Reforms” (Welsh Government, Sep 9, 2024). Supports: the reforms came into force that day; a non-statutory service in Wales since 2019; the Shipman Inquiry first proposed the system in 2003.
Department of Health and Social Care, “An overview of the death certification reforms” (gov.uk guidance, updated Aug 14, 2024). Supports: an independent review of every death by a medical examiner or a coroner; the medical examiner’s role; the Coroners and Justice Act 2009; the non-statutory start in 2019; regulations in force on Sep 9, 2024.
gov.uk, “The Shipman Inquiry third report: death certification and the investigation of deaths by coroners,” publication page, Cm 5854. Supports: the publication date, Jul 14, 2003.
The Medical Certificate of Cause of Death Regulations 2024, S.I. 2024/492, regulation 1 (legislation.gov.uk, as made; made Apr 11, 2024). Supports: commencement on Sep 9, 2024, and extent to England and Wales.
The Medical Examiners (England) Regulations 2024, S.I. 2024/493, regulation 1 (legislation.gov.uk, as made; made Apr 11, 2024). Supports: commencement on Sep 9, 2024, for medical examiners appointed by English NHS bodies.
Associated Press, “Nurse who killed 29 sentenced to 11 life terms” (NBC News, Mar 2, 2006). Supports: the New Jersey pleas and the March 2006 sentencing, the 16-year career at 10 hospitals and nursing homes, and hospitals’ failure to share their suspicions.
The Shipman Inquiry (Chairman: Dame Janet Smith DBE), Sixth Report, “Shipman: The Final Report” (Jan 27, 2005), complete text without appendices as published on the Inquiry’s website, archived copy of Jan 12, 2006: paras 7.2 and 7.78. Supports: about 250 patients killed between 1971 and 1998, 218 positively identified; the First Report’s finding of at least 215.
Associated Press, “Ex-nurse pleads guilty to 13 patient deaths” (NBC News, Apr 29, 2004). Supports: his arrest on Dec 12, 2003, and his work at nine hospitals and one nursing home over 16 years.
CBS News, with the Associated Press, “Nurse Pleads Guilty To 13 Killings” (page dated Nov 17, 2004, reporting his first pleas, entered on Thursday, Apr 29, 2004). Supports: New Jersey’s Division of Consumer Affairs had no record of complaints or disciplinary action against him.
New Jersey State Law Library, Legislative History Checklist for L. 2005, c. 83, N.J.S.A. 45:1-33 (“Health Care Professional Responsibility and Reporting Enhancement Act”), bill S1804, with the bill text and the acting governor’s signing release of May 3, 2005. Supports: the date of approval; the release tying the law to the Cullen case and recording his arrest on the charge of murdering the Rev. Florian Gall.
The Medical Examiners (Wales) Regulations 2024, W.S.I. 2024/505 (W. 81), regulation 1 (legislation.gov.uk, as made; made Apr 12, 2024). Supports: commencement in Wales on Sep 9, 2024.
New Jersey Legislature, P.L.2005, c.83 (Senate bill 1804), “Health Care Professional Responsibility and Reporting Enhancement Act,” chaptered law text, approved May 3, 2005: sections 1, 2 and 15. Supports: the law’s name and date, the duty to notify the Division of Consumer Affairs, and the duty to answer other facilities truthfully.
Nick Vadala, “The true story of Charles Cullen” (The Philadelphia Inquirer, Oct 27, 2022; headline shortened). Supports: the pleas to 29 murders, 22 in New Jersey; the 16-year career at 10 hospitals and nursing homes; the clean record; hospitals’ fear of lawsuits; the arrest after the murder of the Rev. Florian Gall; the March 2006 sentencing; the reporting law.
Home Secretary and Secretary of State for Health, “Learning from tragedy, keeping patients safe: Overview of the Government’s action programme in response to the recommendations of the Shipman Inquiry,” Cm 7014 (February 2007), official copy on gov.uk: Foreword and paras 1.7 to 1.9, 2.5 and 2.6. Supports: no further check on the certificate before a burial; the two doctors and the medical referee for a cremation; the Inquiry’s remit, chair and conclusion; the count of around 250.
Sources
Innocence Project, “DNA Exonerations in the United States (1989 – 2020),” static summary of the first 375 DNA exonerations nationwide (page published Jun 22, 2023, last modified Oct 2, 2024, per the page’s own metadata; some figures carry their own “as of” dates in 2018). Supports: tracking ended at 375 in 2020; 165 actual assailants identified and their 154 later violent crimes; the 2018 figures on identification and false confessions.
Diletant, “The Trial: The Case of Aleksandr Kravchenko” (Jan 27, 2018), in Russian, title translated; adapted from the Echo of Moscow radio program “Ne tak” with Alexei Kuznetsov and Sergei Buntman. Supports: the disappearance and the date, the case against Kravchenko, his sentences and execution, the 1991 annulment, both convictions set aside, the Supreme Court’s reasoning on the count against Chikatilo.
Gennady Vetrov, Komsomolskaya Pravda (Kherson edition), article on the case of Aleksandr Kravchenko (Mar 26, 2026), in Russian. Its headline and page title repeat a claim about the murder that Russia’s Supreme Court found unproven, and are omitted here. Supports: the disappearance and the date, the case against Kravchenko, his sentences and execution, the 1991 annulment, his posthumous rehabilitation, the 1992 count and its exclusion, the unsolved status.
Igor Nadezhdin, “How Chikatilo was tried: the trial in documents from the archives” (Lenta.ru, Nov 22, 2020; updated May 10, 2021), in Russian, title translated and shortened; the headline opens with a quotation of the defendant, omitted here. Based on archive trial records. Supports: Kravchenko’s detention and his retraction in court, the October 1992 verdict, the Supreme Court’s removal of the count for lack of proof and the date it reports for that ruling, the later investigator’s challenge.
Innocence Project, “Our Impact: By the Numbers” (“Numbers stated are current as of April 14, 2026”; page last modified Apr 14, 2026). Supports: 89 people who committed the crime identified among 257 client exonerations and releases; 101 additional violent crimes.
Robert J. Norris, Jennifer N. Weintraub, James R. Acker, Allison D. Redlich and Catherine L. Bonventre, “The criminal costs of wrongful convictions: Can we reduce crime by protecting the innocent?” Criminology & Public Policy 19(2), May 2020 (online Sep 2, 2019), pp. 367-388, DOI 10.1111/1745-9133.12463. Abstract as deposited in the Crossref record (the publisher’s page refused the request). Supports: 109 true perpetrators, 102 with additional crimes, 337 additional offenses, the 41,000 estimate.
Sources
FBI Behavioral Analysis Unit-2, National Center for the Analysis of Violent Crime, “Serial Murder: Multi-Disciplinary Perspectives for Investigators,” ed. Robert J. Morton (FBI, 2008): seven myths, including that serial killers are all insane or geniuses; intelligence from borderline to above average; most not adjudicated insane; 2005 San Antonio symposium of 135 experts; Ridgway a truck painter for 32 years
FBI, “Serial Murder - July 2008” (fbi.gov document page): publication date of the monograph
Mike Aamodt, “Serial Killer IQ” (Serial Killer Information Center, Radford University, last updated September 16, 2012): IQ information on 202 serial killers, median 89.0, mean 95.1; serial killers taken as a whole appear to be of normal IQ; caution on extreme scores
M. G. Aamodt, “Serial Killer Statistics” (Radford University/FGCU Serial Killer Database, September 4, 2016): IQ N 271, average 94.5, median 86.0, range 54 to 186; 4,743 serial killers and 13,105 victims; FGCU partnership 2012; the FBI’s 2005 symposium in San Antonio
Office of Justice Programs, NCJRS Virtual Library, abstract record for “Serial Murder: Multi-Disciplinary Perspectives for Investigators,” NCJ Number 223848 (undated record): date published 2008; the seven myths the symposium discounted
Mike Aamodt, “Project Description” (Serial Killer Information Center, Radford University, last updated September 4, 2016): project began in 1992; data added and revised continually; 4,743 serial killers; database built from information collected by Radford students
Benjamin H. Smith, “Ed Kemper: The Horrifying True Tale Of The Santa Cruz ‘Co-Ed Killer’” (Oxygen, April 13, 2023; first published October 9, 2018): victims’ names, IQ 145 at Atascadero, Pueblo call, conviction on eight counts November 8, 1973
Biography.com Editors, “Edmund Kemper” (Biography, updated October 3, 2023): victims’ names, the April 1973 call from Pueblo, police disbelief, eight counts of first-degree murder, guilty in November 1973
Radford University students, “Edmund Emil Kemper III” case summary (Radford University Department of Psychology, course file “Kemper, Ed - 2004”; latest entry 2004): IQ 145; repeated calls from Pueblo; arrested April 24, 1973
San Francisco State University, DIVA, “Investigating Edmund Kemper” (KPIX news footage, April 25, 1973): confession from a phone booth in Pueblo, Colorado
King County Sheriff’s Office, “Green River homicides investigation” (King County, undated, accessed October 8, 2026): first victims found July 1982; at least 48 women linked; guilty plea to 48 counts, November 5, 2003
David Wilma, HistoryLink.org Essay 4262, “Gary Leon Ridgway pleads guilty to murdering 48 Green River Killer victims on November 5, 2003” (posted November 5, 2003): plea date and count; bodies found in and along the river within a month; DNA sample collected in 1987; Mark Prothero among court-appointed defenders
HistoryLink Staff, HistoryLink.org Essay 3648, “Police arrest Green River Killer suspect on November 30, 2001” (posted December 2, 2001): arrest date; Wendy Lee Coffield, 16, found July 15, 1982; detectives had not found adequate evidence to build a case
Ian Ith, Steve Miletich and Duff Wilson, “Detectives’ case hinges on 14-year-old saliva sample in Green River arrest” (The Seattle Times, December 1, 2001): 1987 saliva sample, new DNA testing, arrest at work, painter for more than 30 years, lie-detector test reported by Smith and Guillen, prosecutors lacked evidence for trial
Wiley, product page for Mark Prothero with Carlton Smith, “Defending Gary: Unraveling the Mind of the Green River Killer” (Jossey-Bass, e-book, ISBN 978-0-787-98508-0, April 2006): Prothero a co-lead defense attorney for Gary Ridgway; written with Carlton Smith
Steve Miletich, “Ridgway stayed cool in interview 19 years ago” (The Seattle Times, February 10, 2004): polygraph passed in 1984
Mark Prothero with Carlton Smith, “Defending Gary: Unraveling the Mind of the Green River Killer” (Jossey-Bass, 2006), p. 150, read through Google Books search inside the book: Ridgway’s IQ on unwritten tests came out to be 85; average intelligence is 100
Sources
FBI Behavioral Analysis Unit-2, National Center for the Analysis of Violent Crime, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (FBI, 2008): the myth that serial killers cannot stop killing, its reasons and its two examples (Rader, Gorton); the 2005 symposium; the computer disk that identified Rader
FBI, “Serial Murder - July 2008” (fbi.gov document page): publication date of the monograph
Congressional Research Service, “Mass Murder with Firearms: Incidents and Victims, 1999-2013,” R44126 (July 30, 2015; EveryCRSReport copy): cites the FBI serial murder report as July 2008 and the 2005 symposium behind it
Associated Press, “Fast Facts: BTK Victims” (Fox News, August 18, 2005): names, ages and dates of the ten victims
Tim Potter and Stan Finger, Knight Ridder Newspapers, “Police detail capture of BTK” (Lawrence Journal-World, July 10, 2005): victims and dates; the Feb. 25 arrest; the diskette traced to his church; the DNA match to three scenes; Lt. Ken Landwehr on an 11th victim
CBS News, “BTK Victims” (photo gallery, March 26, 2004, updated June 28, 2005): names, ages and dates of the victims; the 2004 letter after years of silence
JURIST, “BTK killer pleads guilty to 10 murders” (University of Pittsburgh School of Law, June 27, 2005): charged with 10 murders between 1974 and 1991; guilty plea as his trial began in Wichita, Kansas
Mark Hansen, “How the Cops Caught BTK” (ABA Journal, May 1, 2006): Lt. Ken Landwehr headed the task force; the disk traced through a church computer; DNA confirmation; the Feb. 25, 2005 arrest; the plea to 10 counts; planning another murder when arrested
Associated Press, “Man pleads no contest in 1986 rape, murder of Flint provost” (The Michigan Daily, January 8, 2003): Margarette Eby and Nancy Ludwig; Jeffrey Gorton’s conviction and no-contest plea; his DNA matched to both scenes
City of Irvine, “Serial Killer Linked to Two Irvine Homicides Arrested in Northern California” (press release, April 25, 2018): Janelle Cruz, 18, killed May 5, 1986, while her family was away
FBI, “Cold Case Killer” (FBI news story, June 15, 2016, updated April 25, 2018): the 1986 Irvine murder as the last known crime in the series; DNA from multiple crime scenes
Orange County District Attorney, “Joseph James DeAngelo Jr. Pleads Guilty to 13 Murders, 13 Kidnappings and Dozens of Additional Uncharged Crimes” (joint press release, June 29, 2020; Case # 18FE008017): plea to 13 counts of first-degree murder in People v. Joseph James DeAngelo; the murders he admitted, with dates; last victim in 1986; identified by genetic genealogy in 2018
Janelle Griffith, NBC News, “Golden State Killer suspect pleads guilty to 13 counts of first-degree murder” (June 29, 2020): the plea; former police officer; April 2018 arrest; genetic genealogy; 13 known murders from 1975 to 1986
Maria Dinzeo, Courthouse News Service, “Golden State Killer Pleads Guilty to 13 Murders, Admits to Multiple Rapes” (June 29, 2020): 13 first-degree murder counts before Sacramento Superior Court Judge Michael Bowman; Claude Snelling, 1975; killings ended 1986; arrested 2018 in Citrus Heights; the 1980 Ventura DNA sample and the family tree
KABC, “Former Irvine mom speaks out 32 years after daughter was murdered by ‘Golden State Killer’” (ABC7, May 14, 2018): Janelle Cruz’s age; her mother away on vacation
Associated Press, “Golden State Killer Joseph DeAngelo admits to dozens of rapes and murders” (ABC13 Houston, June 29, 2020): plea to 13 counts of murder; crimes ended in 1986; never on investigators’ radar; genealogy database and family tree; retired truck mechanic; Sacramento County Superior Court
KPIX 5, “Who Is Golden State Killer Suspect Joseph DeAngelo?” (CBS San Francisco, April 26, 2018): worked as a mechanic for 27 years and retired the year before his arrest
Emily Shapiro, ABC News, “‘Golden State Killer’ victim’s sister: ‘I can finally breathe again’” (April 26, 2018): arrested in Citrus Heights; his name had never come up in the investigation
Sacramento County District Attorney’s Office, media advisory for the court hearing in People vs. Joseph James DeAngelo (June 2020): case name and hearing date, June 29, 2020
Kathleen Ronayne, Associated Press, “Records: DNA from tissue led to Golden State Killer arrest” (KSL.com, June 2, 2018): DNA from the 1980 Smith double murder in Ventura County used to find a relative, per the warrants
Sources
FBI, Behavioral Analysis Unit-2, National Center for the Analysis of Violent Crime, “Serial Murder: Multi-Disciplinary Perspectives for Investigators,” ed. Robert J. Morton (FBI, 2008), GPO copy at govinfo.gov, pp. 2–6 and 41: the seventh myth, its heading and text; where the myths come from; the case study of the Wichita investigation’s media strategy
Office of Justice Programs, NCJRS Virtual Library, record NCJ 223848, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (U.S. Department of Justice): date published 2008; the myths the symposium discounted, in the report’s order
FBI, “Serial Murder: New Report Highlights Views of Experts,” FBI news story (July 7, 2008), Internet Archive copy of archives.fbi.gov: the FBI’s summary of the myth and of the screen version
Complaint/Information, State of Kansas v. Dennis L. Rader (District Court of Kansas, Eighteenth Judicial District, Sedgwick County, Criminal Department, 2005), text published by Court TV’s Crime Library, Internet Archive capture of Oct. 6, 2006: the ten counts of first-degree murder, with names and dates
Associated Press, “Fast Facts: BTK Victims” (published by Fox News, Aug. 18, 2005): the names of the ten people killed
JURIST, “BTK killer pleads guilty to 10 murders” (JURIST Legal News, June 27, 2005): the guilty plea to ten murders committed between 1974 and 1991
Mark Hansen, “How the Cops Caught BTK” (ABA Journal, May 1, 2006): the disk question, the classified ad, the trace to his church, and the account of the lieutenant who led the task force
Associated Press, “Computer disk may have cracked BTK case” (published by NBC News; the page shows Feb. 17, 2005, and its metadata records an update on March 3, 2005): the disk traced to the church, the arrest, a former police chief’s view
Associated Press, “Timeline of terror” (published by the Deseret News, Feb. 27, 2005), entries for Sept. 16, 1986 and March 19, 2004: the letter that renewed contact
NBC News (msnbc.com news services), “Neighbors paint mixed picture of BTK suspect” (Feb. 26, 2005): the March 2004 letter; a former police chief’s view
Roxana Hegeman, Associated Press, “Police break silence on BTK manhunt” (published by the Lawrence Journal-World, Aug. 20, 2005): the classified ad, the disk, the name Dennis, the DNA match, the plan to kill again, the state investigation director’s view
National Law Enforcement and Corrections Technology Center, a program of the National Institute of Justice, “Technology Primer: Data . . . About Your Data,” reprinted from TechBeat (Fall 2005): the disk mailed to a television station and traced through its metadata to his church
Amy Tikkanen, “Dennis Rader” (Encyclopaedia Britannica, last updated Aug. 26, 2025), read through an Internet Archive copy: the disk question, the classified ad, the trace to his church, his reaction to the deception
Sources
FBI, Behavioral Analysis Unit-2, National Center for the Analysis of Violent Crime, “Serial Murder: Multi-Disciplinary Perspectives for Investigators,” ed. Robert J. Morton (FBI, 2008), GPO copy at govinfo.gov, pp. 3–4: the first myth, its heading, its text and the report’s three examples
Office of Justice Programs, NCJRS Virtual Library, record NCJ 223848, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (U.S. Department of Justice): date published 2008; the myths the symposium discounted, in the report’s order
FBI, “Serial Murder: New Report Highlights Views of Experts,” FBI news story (July 7, 2008), Internet Archive copy of archives.fbi.gov: the FBI’s summary of the loner myth
Supreme Court of Washington, State v. Yates, No. 73155-1 (decided Sept. 27, 2007), text hosted by FindLaw: the 2002 convictions for the Pierce County murders and the 2000 pleas
Supreme Court of Washington, In re Personal Restraint of Yates, No. 82101-1 (filed March 14, 2013), slip opinion, statement of facts: the 2000 plea to 13 counts and the 2002 Pierce County convictions
Seattle Times staff, “Timeline of the Green River killer case” (The Seattle Times, Feb. 18, 2011): the first victim found, police contact in 1983, 1984 and 1987, the arrest, and the pleas of 2003 and 2011
David Wilma, HistoryLink.org Essay 4262, “Gary Leon Ridgway pleads guilty to murdering 48 Green River Killer victims on November 5, 2003” (posted November 5, 2003): Wendy Lee Coffield, the 48 victims, the 1987 sample, the November 30, 2001 arrest
Ray Rivera and Ian Ith, “Ridgway pleads guilty to 48 Green River murders” (The Seattle Times, Nov. 5, 2003): the names read in court, police contact in 1983, 1984 and 1987, the same job for 32 years
Associated Press, “‘Green River Killer’ pleads guilty to 49th murder” (published by NBC News, Feb. 18, 2011): the plea for the murder of Rebecca Marrero
Complaint/Information, State of Kansas v. Dennis L. Rader (District Court of Kansas, Eighteenth Judicial District, Sedgwick County, Criminal Department, 2005), text published by Court TV’s Crime Library, Internet Archive capture of Oct. 6, 2006: the ten counts, from Joseph Otero in 1974 to Dolores E. Davis in 1991
Associated Press, “BTK killer waives trial, admits 10 slayings” (published by NBC News; the page is stamped June 26, 2005, and its text reports Monday’s plea): the plea, his home in Park City, his church and scouting roles
Mark Hansen, “How the Cops Caught BTK” (ABA Journal, May 1, 2006): his city job, the church website, the 2005 plea
King County Prosecuting Attorney’s Office (Norm Maleng, Prosecuting Attorney), “Prosecutor’s Summary of the Evidence,” State of Washington v. Gary Leon Ridgway, No. 01-1-10270-9 SEA (Superior Court of Washington for King County; 133 pages; filed with the plea in November 2003, per The Seattle Times of Nov. 6, 2003; the copy’s date line is blank), copy posted by The Seattle Times, Internet Archive capture of Jan. 28, 2005: section “Flying Under the Radar” and his employment. The document carries a graphic-content warning; only the lines quoted here are used.
Ray Rivera, report on the King County prosecutors’ 133-page summary of evidence (The Seattle Times, Nov. 6, 2003): the prosecutors’ description of him and his job
NBC News (msnbc.com news services), “Neighbors paint mixed picture of BTK suspect” (Feb. 26, 2005): his household in Park City, his city job, his church
Orange County District Attorney, “Joseph James DeAngelo Jr. Pleads Guilty to 13 Murders, 13 Kidnappings and Dozens of Additional Uncharged Crimes,” press release (June 29, 2020): the plea, the 13 murders by name and date, his police jobs, his identification in 2018
Janelle Griffith, “Golden State Killer suspect pleads guilty to 13 counts of first-degree murder” (NBC News, June 29, 2020): the plea, the arrest in April 2018, the 13 murders between 1975 and 1986, genetic genealogy
Laurel Wamsley, “After Arrest Of Suspected Golden State Killer, Details Of His Life Emerge” (NPR, April 26, 2018; copy published by CapRadio): his police jobs, his marriage, his 27 years in a supermarket distribution warehouse
Associated Press, “The Latest: Alleged serial killer worked in warehouse” (published by Fox News, April 26, 2018): the employer’s statement, the sheriff’s account of his police service, the district attorney’s statement
ABC7 News (KGO-TV, San Francisco), “WHO IS HE: The life and history Joseph DeAngelo, the alleged Golden State Killer” (page dated May 24, 2018): his daughters and his job
Matthias Gafni, “Golden State Killer’s wife speaks out: ‘I trusted he was doing what he told me he was doing’” (San Francisco Chronicle, Aug. 20, 2020): the 1973 marriage and their three daughters
KPIX 5 (CBS San Francisco), “Who Is Golden State Killer Suspect Joseph DeAngelo?” (April 26, 2018): the employer’s statement on his 27 years as a mechanic
Sources
FBI, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (2008): the 2005 symposium, its place and dates
FBI, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (2008): earlier definitions ranged from two to ten victims
FBI, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (2008): why the number of victims was set low, and why motive was left out
FBI, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (2008): the definition of spree murder
FBI, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (2008): most attendees advocated dropping spree murder as a category
FBI, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (2008): defines serial murder
FBI, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (2008): the older time requirement, and how mass murder was generally described
FBI, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (2008): the purpose and limits of the 1998 statutory definition
28 U.S. Code § 540B, “Investigation of serial killings” (Legal Information Institute, Cornell Law School): defines serial killings
Public Law 105-314, Protection of Children From Sexual Predators Act of 1998, section 701 (U.S. Government Publishing Office, govinfo): added section 540B to Title 28
Public Law 112-265, Investigative Assistance for Violent Crimes Act of 2012 (U.S. Government Publishing Office, govinfo): Attorney General may assist in mass killing investigations on request
Congressional Research Service, “Mass Murder with Firearms: Incidents and Victims, 1999-2013,” R44126 (July 30, 2015; EveryCRSReport copy): the 2013 statutory definition of mass killings, the 1998 serial-killings provision, and the FBI’s 2005 symposium
Lauren Paterson, Northwest Public Broadcasting, “Bryan Kohberger pleads guilty to murders of four University of Idaho students” (Spokane Public Radio, July 2, 2025): the victims, the date and the plea
Associated Press, “The Latest: Judge sentences Kohberger to life in prison for murdering 4 University of Idaho students” (WSLS, July 23, 2025): the victims, the date and the sentence
State of Idaho v. Bryan C. Kohberger, Case No. CR01-24-31665, “Judgment of Conviction and Commitment” (District Court, Fourth Judicial District, Ada County, filed July 23, 2025; Idaho Supreme Court, Cases of Interest): the pleas of July 2, 2025 and the sentence
Kerry Breen, CBS News, “Bryan Kohberger pleads guilty to murdering 4 University of Idaho students in 2022” (July 2, 2025): the place, the date and the plea
Sources
David V. Canter, Laurence J. Alison, Emily Alison and Natalia Wentink, “The Organized/Disorganized Typology of Serial Murder: Myth or Model?” Psychology, Public Policy, and Law 10(3), 2004, pp. 293–320 (publisher’s abstract, APA PsycNet): the finding, the sample and the method
Craig Bennell, Sarah Bloomfield, Karla Emeno and Evanya Musolino, “Classifying Serial Sexual Murder/Murderers: An Attempt to Validate Keppel and Walter’s (1999) Model,” Criminal Justice and Behavior 40(1), January 2013, pp. 5–25: how the model is cited and summarized, and what the 2004 test assessed
Robert R. Hazelwood and John E. Douglas, “The Lust Murderer,” FBI Law Enforcement Bulletin 49(4), April 1980, pp. 18–22 (scanned issue, NCJRS digitization 68689): the authors and their unit, the two types, and the limit they set on profiling
NCJRS Virtual Library record NCJ 68689, “Lust Murderer” (R. R. Hazelwood and J. E. Douglas, FBI Law Enforcement Bulletin 49(4), April 1980, pp. 18–22): authors, date, the two types, and what the profile was based on
FBI Law Enforcement Bulletin 54(8), August 1985, special issue on sexual homicide research, including “Crime Scene and Profile Characteristics of Organized and Disorganized Murderers,” pp. 18–25 (scanned issue, NCJRS digitization 99114–99117): project staff, the technique, the 36 interviews, the classification and the conclusion
Canter, Alison, Alison and Wentink, “The Organized/Disorganized Typology of Serial Murder: Myth or Model?” (2004), accepted version, University of Huddersfield Repository: the critique of the 36-interview sample, the data and coding, and the conclusion
NCJRS Virtual Library record NCJ 99117, “Crime Scene and Profile Characteristics of Organized and Disorganized Murders” (R. K. Ressler and A. W. Burgess, FBI Law Enforcement Bulletin 54(8), August 1985, pp. 18–25): the sample and the 24/12 classification
FBI, National Center for the Analysis of Violent Crime, Behavioral Analysis Unit-2, “Serial Murder: Multi-Disciplinary Perspectives for Investigators” (2008), section V: typologies, and why serial cases defeat the usual relationship-based approach
Congressional Research Service, “Mass Murder with Firearms: Incidents and Victims, 1999–2013,” R44126 (July 30, 2015; EveryCRSReport copy): dates the FBI’s serial murder report to 2008
Sources
Steven Egger, “The Less-Dead,” in Eric Hickey (ed.), Encyclopedia of Murder and Violent Crime (Sage, 2003), DOI 10.4135/9781412950619.n255: defines the less-dead
Ray Rivera and Ian Ith, “Ridgway pleads guilty to 48 Green River murders” (The Seattle Times, Nov. 5, 2003): the roll call read in court
Associated Press, “Serial killer pleads to 48 murders” (Lawrence Journal-World, Nov. 6, 2003): 48 counts, a case that began in 1982
Associated Press, “Serial killer pleads to 48 murders” (Lawrence Journal-World, Nov. 6, 2003): his written plea statement on how he chose his victims
Indiana University, “Serial killers may kill more victims than we think” (news release, Dec. 3, 2007), on Kenna Quinet, “The Missing Missing,” Homicide Studies: the 48 known victims
Lewis Beale, “‘Missing Missing’ and Serial Killers” (Pacific Standard, Feb. 12, 2008): Quinet’s point on the known victims
FBI, “Samuel Little: Confessions of a Killer” (Oct. 6, 2019): 93 confessions, 50 verified
FBI, “Samuel Little: Confessions of a Killer” (Oct. 6, 2019): deaths first ruled overdoses, accidental or undetermined
Doha Madani, “FBI confirms Samuel Little’s confession: He is the worst serial killer in U.S. history” (NBC News, Oct. 7, 2019): 50 verified; who his victims were
People v. Gacy, 103 Ill. 2d 1 (Ill. 1984), Caselaw Access Project: Robert Piest, December 11, 1978
People v. Gacy, 103 Ill. 2d 1 (Ill. 1984): the December 13 warrant and the December 11 missing-person report
People v. Gacy, 103 Ill. 2d 1 (Ill. 1984): the December 21 warrant
NBC Chicago, “Timeline of Serial Killer John Wayne Gacy’s Life, Case” (Oct. 25, 2021, updated Oct. 26, 2021): Piest missing in December 1978, the December 21 search, 33 convictions
Whet Moser, “John Wayne Gacy, Runaways, and the Decline of the Serial Killer” (Chicago magazine, Oct. 18, 2011), quoting Eileen Ogintz, “Missing boy’s family always feared Gacy” (Chicago Tribune, Dec. 25, 1978): the Butkovich family
FBI, “ViCAP Links Murders to Prolific Serial Killer” (Nov. 27, 2018): the women he chose, deaths not classified as homicides, the 2014 conviction
Nichole Manna (Tribune News Service), “John Wayne Gacy’s Capture Happened Because of a Missing Teen Case” (A&E, Oct. 15, 2025): December 11, 1978, and the family’s call to police
Questions
Why do some citations have no link?
- A link is added only after the page it points to has been opened and checked against the fact it supports. Where a record is not online, the citation stands without a link.
What is the difference between a primary record and a second source?
- A primary record is the document itself: a court ruling, a plea statement, an inquiry report, an agency release. A second source is a published account that confirms it.
Is Wikipedia used as a source?
- No. An encyclopedia entry is never the record. It can point to a primary document, and the primary document is what gets cited.