Jett Travolta's body shows no sign of head injury and his death certificate says he was killed by a seizure.

The autopsy results have not yet been released but according to an undertaker and the death certificate, the cause of death was a seizure.

The 16-year-old's celebrity parents prepared to return his remains to the United States.

Jett Travolta had a history of seizures and was found unconscious in a bathroom Friday at a family vacation home on Grand Bahama Island.