The Zodiac Killer was a serial killer who operated in Northern California in the late 1960s. The Zodiac killer's identity remains unknown. The Zodiac killer coined the name "Zodiac" in a series of taunting letters sent to the local Bay Area press.
These letters included four cryptograms (or ciphers), three of which have yet to be solved. The Zodiac murdered victims in Benicia, Vallejo, Lake Berryessa, and San Francisco between December 1968 and October 1969.
Four men and three women, between the ages of 16 and 29, were targeted. Numerous suspects have been named by law enforcement and amateur investigators, but no conclusive evidence has surfaced.