Ronald Gabriel "Ron" Palillo (April 1949 – August was an American television and film Palillo was best known for his role as high school student Arnold Dingfelder Horshack on the ABC sitcom Welcome Back, Kotter, which aired from 1975 to
Ron Palillo -- the actor who played Horshack on "Welcome Back, Kotter" -- died this morning at his home near Palm Beach, FL from an apparent heart attack . this according to someone close to the actor.
August 2012 (Ron Palillo) Horshack from "Welcome Back, Kotter," but to horror fans he'll always be Allen Hawes in Jason Lives: Friday the Part VI . Ron Palillo has passed away at age 63 from a heart attack.