The FBI confirmed to reporters in Florida Wednesday that investigators found what appear to be human remains, “along with personal items, such as a backpack and notebook belonging to Brian Laundrie,” just hours after Laundrie’s parents searched the Myakkahatchee Creek Environmental Park.

Brian Laundrie has been named a person of interest in the disappearance and subsequent homicide of his fiancée, Gabby Petito. The FBI later issued a warrant for his arrest on charges related to his unauthorized use of a bank card.

Forensic pathologist Dr. Michael Baden tells “Fox & Friends First” that he agrees with the belief that the remains found yesterday in a Florida park is likely Brian Laundrie.

“The difficult part will be the cause of death depending on the environment, since he was underwater apparently for a while,” he said.