An 11-year-old witness points a finger at her father's suspected killer: Her sister's forbidden boyfriend

Sierra Friar, 18 years old at the time of her exclusive interview with "48 Hours," talks about the morning of Oct. 2, 2017, when her father, Aaron, and 15-year-old sister, Ellie, vanished.

11-year-old Sierra Friar wakes up to her father Aaron Friar yelling and the sound of glass breaking around 5:30 a.m. Terrified, she stayed in her room until she felt safe enough to come out.