'Burn after reading': Gabby Petito's parents say letter from Brian Laundrie's mom offered to help bury body

Brian Laundrie’s mother wrote a letter that said she, "would bring a shovel to help bury a body," according to a request filed Tuesday by the lawyers for Gabby Petito’s family; the letter's envelope said, "Burn after reading." The existence of the letter was first revealed in documents filed with Sarasota County courts in December. Motions filed Tuesday say Brian's father, Christopher, and mother, Roberta, have 30 days to produce the letter.