Jett was the oldest child of Travolta, 54, and his wife, actress Kelly Preston, 46, who also have an 8-year-old daughter, Ella Bleu.
Preston and Travolta have said that Jett became very sick when he was 2 years old and was diagnosed with Kawasaki disease, an illness that leads to inflammation of the blood vessels in young children. She blamed household cleaners and fertilizers, and said that a detoxification program based on teachings from the Church of Scientology helped improve his health, according to People magazine. Both Travolta and Preston are practicing Scientologists.
“I was obsessive about his space being cleaned. We constantly had the carpets cleaned,” Travolta said in a 2001 interview with CNN’s Larry King, a portion of which was rebroadcast on the “Larry King Live” show Friday night. During that interview, when Jett was 9, Travolta spoke of how his son nearly died when he was 2.
It is unclear whether Jett was taking any medications for his seizures.
The Scientology Celebrity Center in Los Angeles declined to comment.