The Zodiac Killer is one of the most notorious and mysterious serial killers in American history. The killer was active in California in the late 1960s and early 1970s and was responsible for at least five murders, although some believe the number could be higher. The killer was known for taunting police and the public with cryptic letters and codes, and he was never caught or identified. Despite decades of investigation and numerous suspects, the identity of the Zodiac Killer remains a mystery.

The first known murder attributed to the Zodiac Killer occurred in December 1968, when two teenagers were shot and killed in a parked car in Vallejo, California. Over the next year, the killer would strike again, killing two more couples in separate