In the final entry for our series on unsolved serial killer cases, we look at the Zodiac Killer, who terrorized the San Francisco Bay Area with a string of killings from 1968-69 and then for years after with disturbing letters sent to the local press. 

Our primary sources for this episode were:

"Zodiac" by Robert Graysmith

www.zodiackiller.com

http://www.strangemag.com/exorcistpage1.html

Music in this episode is courtesy of musopen.org

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