The name Zodiac Killer was given to him because of the series of letters and cards that he mailed to the press. The killer will send these mails threatening killing sprees and bombings if they were net printed.
The Zodiac Killer is the pseudonym of an unidentified serial killer who operated in Northern California in the late 1960s.
The true identity of the killer is still unknown. The case remains unsolved. Some police departments in the US still have the case open.
The two suspects in the case are all dead. Arthur Ligh Allen died in 1990. Gary Francis Poste also died in 2018.
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.
Since 1974, nothing has been heard from the Zodiac Killer. He stopped mailing letters and cards. He also stopped murdering people in 1969.