Unexplained Mysteries: The Zodiac Killer Pt. 1 (with Greg and Vanessa!)

In the summer of 1969, newspapers in Northern California began receiving coded letters from a person who would come to identify themselves as "The Zodiac." The author of the letters taunted the police by giving clues related to a series of unsolved murders, but did the cryptic messages truly come from the mind of the killer?

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