20 Mind-Blowing Facts You Didn't Know About Zodiac (2007)

20. The Film Caused The Investigation To Reopen

Despite being one of the most infamous cases in history, San Fransisco Police Department actually closed the case back in 2004, due to a lack of new leads or evidence. While it remained open in Riverside, Napa Valley and Vallejo, there were no advances due to the lack of resources that the smaller departments had. However, the SFPD saw fit to reopen the investigation after the release of David Fincher's film.

An increased public interest accounted for part of that decision, with multiple reports coming in with fresh accusations and suspects. However, investigators were also interested in the amount of research and interviewing that went into the production. Fincher and his researchers had done such a thorough job, they managed to uncover evidence that the police had missed previously.

Unfortunately, the new leads failed to produce enough evidence to bring the killer to justice, and as things currently stand, the Zodiac case is still open across the four departments. Vallejo police have been looking into DNA on stamps that the killer used to send his letters, the idea being that they could collar them in a similar way they caught the Golden Gate Killer.