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This five-part limited series, features a team of top investigators and code-breakers, working in tandem with a super-computer, known as CARMEL, the first of its kind programmed to think like a killer. This team believes they may have broken a significant portion of the diabolically complicated code, Z340, and have been granted unprecedented access to police files, new witnesses, new clues, and the cooperation of representatives of the CIA and FBI.

Tuesday at 10:00 on History
1 Season, 5 Episodes
November 14, 2017
Documentary & Biography
Cast: Craig P. Bauer, Michael Butterfield, Ryan Garlick, Kevin Knight
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The Hunt for the Zodiac Killer Full Episode Guide

  • Sal and Ken investigate San Francisco, the epicenter of the Zodiac Killer murders, as the Code Team announces extraordinary news: A team member has solved the Zodiac's infamous Z340 code, which has eluded codebreakers for 50 years.

  • The hunt goes into high gear as the FBI releases secret files; and a handwriting analyst connects the Zodiac Killer's letters to a taunting correspondence mailed 3000 miles away in Albany, N.Y.

  • The team uncovers a mysterious new cipher related to the Zodiac Killer, while the supercomputer uncovers a strange lunar pattern linking the killings; a taunting riddle by the killer may lead to a body; a second prime suspect emerges.

  • The hunt uncovers clues that the Zodiac Killer may have served in the U.S. Armed Forces, as the team's supercomputer identifies strange symbols in the killer's code that would have been known to only a few when it was written.

  • In the premiere of a chronicle of the hunt for California's Zodiac Killer, who murdered at least five people in the San Francisco Bay Area in the late 1960s and early '70s, a prime suspect with code training emerges.

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