"Burn after reading" letter reveals disturbing details in Brian Laundrie case.

A letter written by Brian Laundrie's mother, Roberta Laundrie, was approved for release by a judge in the civil lawsuit filed by the parents of Gabby Petito. In the letter, Roberta wrote that she would "show up with a shovel and garbage bags" if her son needed to dispose of a body. The letter was found with Brian's body, and he claimed responsibility for Petito's death in a notebook. The Petitos claim in the suit that Laundrie's parents concealed their son's murder confession while the investigation was ongoing. The Laundries' lawyer disputes that the letter was anything more than an expression of love between a mother and son.