John Travolta tried frantically to revive his unconscious son Jet after the 16-year-old was found in the family's Bahamas holiday home.
Travolta's family lawyer Mike Ossi said the devastated star had tried unsuccessfully to resuscitate his son Jett on Friday. He was so distraught he had to be physically prised from Jett's body.
"He didn't want anything to happen to that boy, and he kept on trying to revive him," Mr Ossi said. "He did mouth-to-mouth until they had to physically remove John to take Jett to the hospital."
Jett may have died in his father's arms, according to a US magazine.
Jett had a history of seizures and was found unconscious in a bathroom last Friday at the family holiday home.
A family doctor for the Travoltas observed the post-mortem examination yesterday on the island of Grand Bahama.
Jett's body was expected to be transferred soon to Grand Bahama's Restview Memorial Mortuary, said Glen Campbell, an assistant funeral director.
The family plans to send his remains by Wednesday to Ocala, Florida.
"We are heartbroken that our time with him was so brief. We will cherish the time we had with him for the rest of our lives," Travolta and his wife Kelly Preston said on Sunday in their first public statement since Jett's death.
Travolta (54) and Preston (46) have said that Jett became very sick when he was two years old and was diagnosed with Kawasaki syndrome, an illness that leads to inflamed blood vessels in young children.
Experts said that the disease was rarely fatal and seldom affected children over the age of eight. The Travoltas have linked their son's condition to house-cleaning agents.
"With my son I was obsessive about cleaning -- his space being clean, so we constantly had the carpets cleaned," Travolta told CNN in 2001.
"And I think, between him, the fumes and walking around, maybe picking up pieces or something, he got what is rarely a thing to deal with, but it's Kawasaki syndrome."
Preston said in 2003 that she had detoxed her son in a programme devised by Scientology founder L Ron Hubbard. "Initially I had a friend of mine, an environmental scientist and a toxicologist, go through our home and tell us exactly what was going on in the home. It wasn't only the carpet. We had lots of cleansers under the sink. We were using all sorts of chemicals."
Critics of Scientology suggested yesterday that Jett may have been suffering from autism, a condition that the church does not recognise because it considers mental illness to be psychosomatic and argues that it should be treated through spiritual healing.