Mother's Chilling Letter Promises to Help Son Dispose of Body

Brian Laundrie's mother wrote him a letter saying she would help him "dispose of a body" before he killed his girlfriend Gabby Petito.
The letter was found in Laundrie's backpack after he killed himself and Petito's body was found in a Wyoming national park.
Petito's parents obtained the letter in their lawsuit against Laundrie's parents, claiming they knew about her murder and tried to help their son escape justice.
Laundrie's mother claims the letter was written before the couple's trip and was meant to show her love for her son, though Petito's parents argue it proves the Laundries' knowledge of the crime.
Laundrie confessed to killing Petito in a note left near his remains before taking his own life a month after her body was found.