Ron Palillo, best known as mouthy classroom goofball Arnold Horshack on the 1970s TV series "Welcome Back, Kotter," died Tuesday at his home in Palm Beach Gardens, Fla. He was 63.

Palillo had been teaching acting classes at G-Star School of the Arts, a charter school in Palm Springs, for about three years. Before that, he had lived in New York and had done other television and theater work as well as giving lectures.

Palillo played Horshack on the popular sitcom, which also starred Gabe Kaplan and a young John Travolta. It originally aired on ABC from 1975 to 1979.

The show focused on Kaplan's character, Gabe Kotter, who returned to his high school in Brooklyn -- the fictional James Buchanan High -- to teach a remedial class to which he once belonged.

Palillo's character belonged to an unruly group of students known as the Sweathogs. Palillo played the sheepish Arnold Dingfelder Horshack, who would often yell, "Ooh! Ooh! Ooh!" when he thought he knew the answer to a question.

Palillo is survived by his partner of 41 years, Joseph Gramm, a retired actor.

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