Ron Palillo, best known as Arnold Horseshack from the 70s sitcom Welcome Back, Kotter has died at age 63.

The Hollywood Reporter reports the actor died at his home in Palm Beach, Florida.  The cause of death is unknown. A close friend says Palillo had not been ill and had been teaching acting classes in California.

This makes Sweathog death #2 this year - Robert Hegyes, who played Juan Epstein, died of a heart attack in January.