20/20 'Since You've Been Gone' Preview - The case of missing Arizona teen Alissa Turney

20/20 'Since You've Been Gone' Preview - The case of missing Arizona teen Alissa Turney

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Sep 16 2023

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#2020

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 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 2006