Landmark Cases
Zodiac Killer Case
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An unsolved series of murders committed in Northern California between December 1968 and October 1969 by an offender who sent taunting letters and ciphers to newspapers and police through 1974; the offender's identity remains officially unresolved despite many candidate suspects named over the decades.
Facts
Case YearSourced to the subject's own accountFirst confirmed murder December 1968; the killer's correspondence continued through 1974. LocationSourced to the subject's own accountSan Francisco Bay Area, California, United States 1 Investigative or Reform SignificanceSourced to the subject's own accountNotable for the offender's own ciphers: a 408-symbol cryptogram sent to Bay Area newspapers in July 1969 was solved shortly after receipt, while a 340-character cryptogram (Z340) went unsolved for fifty one years until December 2020, and two further short ciphers remain unsolved. 1 Case StatusSourced to the subject's own account Cross-Tradition Connections
Exemplifies
Investigated By
The FBI is one of several agencies that maintain the case status as open, alongside California DOJ and Vallejo, Napa and Solano county authorities.
The SFPD had primary jurisdiction over most of the Zodiac attacks and is the agency whose formal case-status changes (marked inactive in 2004, reopened in 2006) are tracked as the case's official status.
Used In
The killer's cipher letters and handwritten correspondence to newspapers made document and cipher analysis central to the long-running investigation.
Sources
1. Wikipedia: Zodiac Killer
opening sectionQuote, opening section
the only suspect police named was Arthur Leigh Allen, a former elementary school teacher and convicted sex offender who died in 1992
1. Wikipedia: Zodiac Killer
November and December 1969 correspondence sectionQuote, November and December 1969 correspondence section
This 340-character cryptogram remained unsolved for 51 years until December 5, 2020.
1. Wikipedia: Zodiac Killer
1. Wikipedia: Zodiac Killer
1. Wikipedia: Zodiac Killer
Exemplifies: Cold Case, lead sectionQuote, Exemplifies: Cold Case, lead section
The Zodiac Killer (also known by the pseudonym The Zodiac) is an unidentified serial killer.
1. Wikipedia: Zodiac Killer
Investigated By: Federal Bureau of Investigation, Case status sectionQuote, Investigated By: Federal Bureau of Investigation, Case status section
The California Department of Justice, the Federal Bureau of Investigation, the city of Vallejo, and the Napa and Solano county sheriffs maintain the case status as "open".
1. Wikipedia: Zodiac Killer
Investigated By: San Francisco Police Department, Case status sectionQuote, Investigated By: San Francisco Police Department, Case status section
In 2004, the San Francisco Police Department marked the case "inactive", but subsequently re-opened the case in 2006.
Frequently Asked Questions
Has the Zodiac Killer's identity ever been officially confirmed?
No. The offender who committed a series of murders in Northern California between December 1968 and October 1969, and who sent taunting letters and ciphers to newspapers and police through 1974, remains officially unidentified, despite many candidate suspects named over the decades.Reader Challenges (0 open reader challenges)
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