Travolta's Son -- Fatal Blow to Head

We've spoken with John Travolta's lawyer and close friend, Michael McDermott, and family attorney Michael Ossi, both of whom are with John in the Bahamas. They tell TMZ it appears Jett's fatal injury was the result of hitting his head on the bathtub, toilet seat, or both. And they say the intimation that Jett went undiscovered for hours is absolutely false.

Police have said the last time anyone saw Jett was when he went to the bathroom on January 1. His body was discovered by nanny Jeff Kathrein the next day at 10 AM. In fact, McDermott and Ossi say it appears Jett went back and forth to his room and the fatal injury occurred "very shortly" before Jett was found on the bathroom floor -- McDermott called it a "small window of time."

McDermott and Ossi tell us two nannies were present on the trip and Jeff was by his side 24/7. There was a baby monitor device by Jett's side and there was also a chimer in the bathroom when the door opened.

McDermott and Ossi say it is still unclear if Jett fell to the floor as a result of a seizure or if he had a seizure after falling or slipping. There was blood on the floor of the bathroom, but "not a tremendous amount." It appears the striking of Jett's head was the cause of death, though it won't be clear until the autopsy is performed Monday morning.

Jett's body will be embalmed Monday afternoon. There will be a local showing on Tuesday and later that day the body will be flown to Ocala, Fla. for burial.

McDermott says both John and Kelly are night owls. John often goes to sleep at around 5 AM. But McDermott says both nannies were at the hotel and Jeff always present.

McDermott tells us a hotel manager was first on scene with Jeff and the two of them administered CPR. John came in shortly thereafter and John took over for a "substantial period of time [and] was performing CPR and continued that until EMT came and took over."

McDermott says as for Travolta and Preston, the pain is "unimaginable and unquantifiable."

UPDATE: The Grand Bahamas health minister confirms that the autopsy will be conducted by two pathologists to ensure a proper evaluation has been made. A clinical and forensic pathologist from Nassau, that is U.S. certified, will fly into Grand Bahama on Monday to help perform the autopsy.