Brian Laundrie admitted to killing Gabby Petito in a letter he wrote before he died. At the time, his sister, Cassie, told news outlets she had no idea what her late brother had done. Learn more about her.

Brian Laundrie's sister Cassie says she hasn't spoken to her parents in 2 years and was misquoted by police in bodycam video replayed in a new docuseries.

Brian Laundrie's sister, Cassie Laundrie, has spoken out about her estranged relationship with her parents and her lack of involvement in the murder of Gabby Petito.