The FBI's secret files are made public, sparking a renewed effort to catch the Zodiac Killer. A handwriting expert uncovers a surprising connection between the killer's letters and a mysterious letter sent from Albany, New York, 3,000 miles away.
Aired: Nov 14, 2017A shocking new lead surfaces in the decades-long quest to uncover the identit...
Aired: Nov 21, 2017A powerful computer discovers distinct markings in the Zodiac Killer's cipher...
Aired: Nov 28, 2017A cryptic cipher linked to the Zodiac Killer is discovered, revealing a lunar...
Aired: Dec 5, 2017The FBI's secret files are made public, sparking a renewed effort to catch th...
Aired: Dec 12, 2017A major breakthrough in the murder investigation occurs when a team member cr...
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Network: History
Production Country: United States
Genres:Reality-TV, Crime, History
