NORTH PORT, Fla — The boyfriend of missing Long Island woman Gabby Petito has been identified as a person of interest in her mysterious disappearance, police said Wednesday. Brian Laundrie, who returned home to North Port, Fla., on his own after the couple went on a cross-country trip, has lawyered up and refused to cooperate with police. Petito, 22, has been missing since late last month.