Alissa Turney, 17, vanished in 2001. Her half-sister Sarah has been investigating for decades. "I will never give up," she tells PEOPLE. Courtesy Sarah Turney Sarah Turney holding a photo of her ...

PHOENIX, Ariz. -- Officials have made an arrest in the cold case of Alissa Turney, a 17-year-old girl who went missing in Arizona in 2001. The Maricopa County Attorney's Office announced second-degree ...

Sarah Turney became a viral sensation when she posted suspicions on social media that her dad killed her sister, Alissa. Now Sarah, re-examines her and Alissa's childhood.

For Alissa Turney, the end of her junior year of high school meant the start of a new chapter. But as correspondent Andrea Canning explained in Dateline: Unforgettable, when the 17-year-old Alissa ...

Netflix has announced a new true-crime documentary examining the case of Alissa Turney, a Phoenix, Arizona girl who went missing in 2001. The documentary project, which is currently untitled and has ...

Alissa Turney, 17, vanished in 2001. Her half-sister Sarah has been investigating for decades. "I will never give up," she tells PEOPLE. "I always thought growing up that Alissa had behavioral ...