Zodiac Killer case: How the San Francisco Chronicle was involved

Zodiac Killer case: How the San Francisco Chronicle was involved

Postcard sent by serial killer zodiac killer to San Francisco chronic reported paul Avery October 27th 1970

Although the Zodiac claimed in letters to newspapers to have committed 37 murders, investigators agree on seven confirmed assault victims, five of whom died and two survived.

The Zodiac Killer is the pseudonym of an unidentified serial killer[1] who operated in Northern California in the late 1960s. The case has been described as the most famous unsolved murder case in American history. It became a fixture of popular culture and inspired amateur detectives to attempt to solve it.

The Zodiac murdered five known victims in the San Francisco Bay Area between December 1968 and October 1969, operating in rural, urban and suburban settings. He targeted young couples and a lone male cab driver. His known attacks took place in Benicia, Vallejo, unincorporated Napa County, and the city of San Francisco proper. Two of his wounded victims survived. The Zodiac claimed to have murdered 37 victims. He has been linked to several other cold cases, some in Southern California or outside the state.

The Zodiac coined this name in a series of taunting letters and cards that he mailed to regional newspapers, in which he threatened killing sprees and bombings if they were not printed. Some of the letters included cryptograms, or ciphers, in which the killer claimed that he was collecting his victims as slaves for the afterlife. Of the four ciphers he produced, two remain unsolved, and one was cracked only in 2020. While many theories regarding the identity of the killer have been suggested, the only suspect authorities ever publicly named was Arthur Leigh Allen, a former elementary school teacher and convicted sex offender who died in 1992.

Although the Zodiac ceased written communications around 1974, the unusual nature of the case led to international interest that has been sustained throughout the years. The San Francisco Police Department marked the case "inactive" in April 2004, but re-opened it at some point prior to March 2007.

The case also remains open in the city of Vallejo, as well as in Napa and Solano counties. The California Department of Justice has maintained an open case file on the Zodiac murders since 1969.

On October 27, 1970, Chronicle reporter Paul Avery (who had been covering the Zodiac case) received a Halloween card signed with a letter 'Z' and the Zodiac's crossed-circle symbol. Handwritten inside the card was the note "Peek-a-boo, you are doomed." The threat was taken seriously and was the subject of a front-page story in the Chronicle.

 Soon after receiving the letter, Avery received an anonymous letter alerting him to the similarities between the Zodiac's activities and the unsolved murder of Cheri Jo Bates, which had occurred four years earlier at the city college in Riverside in the Greater Los Angeles Area, more than 400 miles (640 km) south of San Francisco. Avery reported his findings in the Chronicle on November 16, 1970.

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