History's Greatest Mysteries (2020)

S4E2 Who is the Zodiac Killer?

In 1969, Northern California becomes the hunting ground for one of history's most notorious serial killers, who instills fear in the community. He mocks law enforcement with puzzling ciphers and hints, keeping both the police and the public guessing about his identity for more than five decades. Will recent advancements in evidence and technology be able to decipher his messages? Who exactly is the Zodiac Killer?