When 17-year-old Alissa Turney disappeared on the last day of her junior year, it initially looked like a classic runaway case ― there was even a goodbye note. But over time, authorities grew suspicious that something more sinister had happened. 20/20 'Since You've Been Gone' full episode with John Quiñones explores the recent twists and turns of the case, including a false confession from a serial killer, the discovery of pipe bombs, and a murder trial acquittal, building on original ABC News reporting from when Alissa disappeared in 2001. Watch FULL EPISODES on Hulu: abcn.ws/3bzvQQn Watch Full Episode Here: shorturl.at/uHJMT #crime #alissaturney #2020 #abcnews