Jett, who began suffering from fits at the age of two, had been found unconscious in a bathroom in the family?s holiday home in the Bahamas. He had later been taken to Rand Memorial Hospital, Freeport, where he was pronounced dead on January 2, reports the Daily Star.
Police and paramedics had speculated that the teenager had fallen and hit his head on a bath. A post mortem revealed 'seizures' to be the cause of his death. Travolta's attorney Michael Ossi had told TMZ.com that the teenager suffered from seizures at regular intervals, which often led him to loose consciousness.
He further said that Jett had been taking a strong dose of Depakote for "several years" to control the attacks but the medication had eventually lost its effectiveness and “began to cause serious physical damage" including damage to his liver. It was claimed that the 54-year-old father and his better half had discontinued administering the drug after consulting neurosurgeons.
Jett was also speculated to have been suffering from autism, a brain development disorder that impairs social interaction and communication, and also produces restricted and repetitive behaviour. An autism activist had recently said Travolta's son's health could have seen better days had his Scientology practising parents decided not to follow their religion's anti-medicine theories.
But the grieving couple have repeatedly denied the allegation saying their son was diagnosed with the Kawasaki disease - a rare illness that leads to inflammation of the blood vessels in young kids, with the most serious effect on the heart.