Ron Palillo, "Arnold Horshack" From "Welcome Back, Kotter," Has Died Actor Ron Palillo, who played Arnold Horshack on the 1970's sitcom "Welcome Back Kotter" died after suffering a heart attack today. He was 63 years old. Horshack will always be known for his "Oooooh Ooooooh."
Robert Hegyes, Juan Epstein of 'Welcome Back Kotter' Dead at 60
La Historia en Cinco de Mayo