Ron Palillo, who played Horschack on Welcome Back, Kotter, has died. He was 63. Welcome Back Kotter ran from 1975-1979 on ABC. Palillo’s role as one of the high school gang known as the Sweathogs was as the goofball. The series starred Gabe Kaplan as Brooklyn teacher Gabe Kotter. John Travolta, Lawrence Hilton-Jacobs and Robert Hegyes, who passed away earlier this year, played the other Sweathogs. After Kotter ended. Palillo performed on Broadway and did artwork for children’s books. The past few years, Palillo taught freshman drama at the G-Star School for the Arts for Motion Pictures and Broadcasting in Palm Beach, Fla.