Unsolved History: Jack the Ripper

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He was the most infamous serial killer of them all, and he was never found. As investigators examine theories into the Ripper's identity, key law enforcement figures and historians delve into recently released documents from London's Scotland Yard. Part of Discovery Channel's "Unsolved History" series, which takes a detailed forensic approach to some of history's most vexing mysteries, this documentary reveals new evidence that could finger the murderer.