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The Zodiac Killer is an unidentified serial killer who operated in Northern California during the late 1960s and early 1970s. He is linked to multiple murders and attacks, primarily targeting young couples in secluded areas. The case became widely known due to the killer’s cryptic letters and ciphers sent to newspapers, in which he claimed responsibility and taunted law enforcement. Despite extensive investigation, his identity remains unknown, making him one of the most infamous unsolved serial killers in history.

A Known Offender is an individual whose identity is publicly established in connection with a homicide or unlawful killing, but who may not have been convicted of murder. In some cases, the offender dies before trial, is found not guilty, is convicted of a lesser offence such as manslaughter, is too young for their identity to be released, or legal restrictions prevent publication of their name. CrimeTrakr includes these offenders where there is reliable, verifiable evidence linking them to the killing while clearly identifying their legal status.