Alissa Turney, 17, vanished in 2001. Her half-sister Sarah has been investigating for decades. "I will never give up," she tells PEOPLE. Sarah Turney, 36, has tried everything to find out what ...

Her stepfather was charged but later acquitted of her murder. Alissa Turney’s sister, Sarah Turney, who hosts the true crime podcast Voices for Justice, spoke out when she posted suspicions on ...