The FBI and a family attorney say items believed to belong to Brian Laundrie and potential human remains have been found in a Florida wilderness park during the search for clues in the slaying of his girlfriend, Gabby Petito.

JACKSONVILLE, Fla. Moments after a 45-year-old nurse was shot to death outside her Jacksonville home, her son knocked on a neighbors door and offered a chilling confession, the neighbor told police. I have done a bad thing, the neighbor recalled hearing Michael McPherson say. I killed mom.The unnamed neighbor told homicide detectives investigating the February killing that he tried to keep McPherson from leaving, but the 21-year-old hopped into his SUV and drove away in a hurry. RELATED: Jacksonville man charged with murder in mothers slayingThose allegations were detailed in the arrest warrant for McPherson, now 22, who was transported to Jacksonville earlier this month to await trial in the murder of his mother, Stacey McPherson-Dillon. Multiple people told police the young man was familiar with guns and was known to carry them.