Jett Travolta had a developmental disability ... but it's Kawasaki syndrome," Travolta said of his then-2-year-old son. Dr. Cam Patterson, general cardiologist at the University of North Carolina ...

April 14 (UPI) --John Travolta wished his late son, Jett, a happy birthday Sunday. Jett died at age 16 in 2009 after having a seizure. Sunday would have marked his 33rd birthday. "Happy birthday ...