Ron Palillo, who portrayed the goofy high school underachiever Arnold Horshack in the hit 1970s sitcom “Welcome Back, Kotter” with such definitive oddballness that he had trouble for years afterward finding work as an actor, died on Tuesday in West Palm Beach, Fla. He was 63.
The apparent cause was a heart attack, said his agent, Scott Stander.
“I know him, love what he does, not right for the part,” Mr. Palillo said in a 1997 newspaper interview, repeating what he said was the mantra of every casting director he met after his years on “Kotter,” which was on ABC from 1975 to 1979. “Everybody thought of me as Arnold Horshack. I resented Horshack for so many years.”
