In 1996, 18-year-old Angie Dodge is found brutally murdered in her Idaho Falls home. Police zero in on a suspect and put a man behind bars. But as the years pass, doubts emerge about whether the real killer was ever caught. Leading the fight for answers is an unlikely advocate: Angie’s own mother, who embarks on a decades-long mission to uncover the truth.

A six-part series from 20/20 and ABC Audio, hosted by Maggie Rulli. New episodes Tuesdays.