By Ann Oldenburg, USA TODAY
Palm Beach, FL - Ron Palillo, who played Arnold Horshack on 1970s sitcom Welcome Back, Kotter, has died in Florida.
TMZ reports Palillo, 63, suffered an apparent heart attack at his home near Palm Beach. The actor was found by his partner, Joseph Gramm, early this morning. Gramm called and ambulance and Palillo was rushed to the hospital, where he was pronounced dead.
The Palm Beach Post quotes a friend of Palillo's as saying the actor "had not been ill."
Palillo, who had been teaching acting classes at G-Star School of the Arts for about three years, was known as one of the Sweathogs in Mr. Kotter's class on the show, along with John Travolta.