1. The Zodiac Killer (1971)
The Movie: As a number of dead bodies turn up in San Francisco, the SF Police Department is harassed and harangued by a series of gloating phone calls and letters from the alleged killer.
The True Story: The Zodiac was a serial killer operating in San Francisco during the 1960s and 1970s. He named himself ‘Zodiac’ in a series of letters sent to the SFPD, and is thought to be responsible for the deaths of seven people. His identity remains unknown.