The serial killer that terrorized California in the late 1960s and early 70's is one of the most notorious unsolved crimes in history. There have been a string of movies, TV specials and books dedicated to the Zodiac Killer and who he may be. With at least five confirmed victims of the Zodiac, this number only appears to only scratch the surface, as the killer himself claimed to take over 30 lives during his killing spree. The Zodiac would leave cryptic and taunting messages to police in the form of newspaper articles and letters, they included three different codes that the Zodiac claimed would reveal his identity. Then the San Francisco Examiner received a letter, in which the killer referred to himself as the Zodiac for the first time, writing, "This is the Zodiac speaking." garnering himself the nickname.

The Zodiac continued sending letters, but then stopped in 1971. But in 1974, he sent one last letter, in which he claimed to have killed 37 people. While there were many suspects, due to lack of sufficient evidence, no-one was ever arrested for the killings and the identity of this notorious killer remains a mystery to this day.