The Bucks County coroner's office says an autopsy determined Dominic Morabito's death at his home in Levittown was a suicide.
Investigators say Morabito was arguing with his girlfriend before the fire broke out on Monday.
Police say the woman told officers she saw Morabito pouring some kind of liquid on the floor of the house before she fled and the house burned.
Fire Marshal Kevin Dippolito says an official ruling on the cause of the fire will have to wait until lab results come back.
