The Hunt for the Zodiac Killer: Season 1, Episode 2 - ProjectFreeTV

1 - 2: The Military Connection

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.