The identity of Jack the Ripper is the greatest mystery in the history of British crime. Swedish journalist Christer Holmgren has sifted through over 120 years of clues, searching for proof that will reveal the true killer. He believes he's finally found his man, and he's off to London to prove it. The Missing Evidence: Jack the Ripper (Full Episode) | 46:15 Smithsonian Channel | 4.28M subscribers | 2,473,885 views | August 23, 2015