From Tenderfoot TV and HowStuffWorks, 'Monster: The Zodiac Killer' dives into one of the most notorious, unsolved serial killing sprees in history. Despite sketches, cyphers and taunting letters to the press, the question still remains: who is the Zodiac? Don't forget to listen to Season 1, 'Atlanta Monster', which tells the true story of one of Atlanta’s darkest secrets, almost 40 years later.
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