Even if you never watched “Welcome Back, Kotter” during its mid-1970s hey-day or in three-plus decades of syndication, you knew Arnold Horshack. He was the high school oddball with the screechy voice, ...

Actor Ron Palillo, best known as the adorably irritating Arnold Horshack from the 1970s sitcom “Welcome Back Kotter,” died yesterday in Florida, marking the second “Sweathog” to pass away this year.

WEST PALM BEACH, Fla. (AP) — Ron Palillo, the actor best known as the nerdy high school student Arnold Horshack on the 1970s sitcom "Welcome Back, Kotter," died Tuesday in Palm Beach Gardens, Fla. He ...

The cast of "Welcome Back, Kotter" featuring John Travolta, Ron Palillo, Gabe Kaplan, Robert Hegyes, Lawrence Hilton-Jacobs. Actor Ron Palillo, best known as the adorably irritating Arnold Horshack ...

“Welcome Back Kotter” star Ron Palillo, who died Tuesday at 63, shined playing a misfit who fit in perfectly with his fellow Sweathogs. Even if you never watched “Welcome Back, Kotter” during its ...