Mourad 'Moni' Samaan and toddler Madeline Layla Samaan-Fay were found dead on Saturday inside his car in a Californian forest near Sacramento.
Samaan sparked a week-long manhunt when he ran away with his daughter after he lost a custody battle with the girl's mother earlier this month.
Brian Golmitz, spokesman for the El Dorado County Sheriff's Department said today an autopsy found that the 49-year-old died of a self-inflicted gunshot wound.
He said Madeline also suffered two gunshot wounds, but her cause of death would be formalised after a toxicology report considers the possibility of carbon monoxide poisoning.
The two were the subject of an FBI amber alert after officials first suspected that she had been abducted by her father.
Samaan received notification on August 6 that the girl's mother, Marcia Ann Fay, 46, had been awarded full custody of their daughter, ending a joint custody arrangement. Read More