

A look at 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 new hunt for the mysterious Zodiac Killer gains unprecedented access to files, unearthing a complicated cypher that may contain the killer’s name, and links between the Zodiac Killer and an unsolved case. A prime suspect with code training emerges.
Aired: 11/14/2017
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. Sal and Ken find new evidence that may lead to the killer.
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