Breaking news from TMZ: Actor Ron Palillo, best know for playing Arnold Horshack on the 70's sitcom Welcome Back, Kotter, has died of a heart attack at age 63. Palillo, was found by his partner about 4am this morning at his West Palm Beach home. He was pronounced dead at the hospital shortly after.

Palillo played Horshack from 1975-79 on the iconic ABC sitcom. After leaving the show his career never had the bite from the early years. He played bit parts on Love Boat and other shows but never played another character like Horshack.

The heart attack was sudden and unexpected. He was said to be in good health, but had a lingering cough, and ironically, had a doctors appointment schedule for today to get it checked out. Oooo-ooo-ooo! Now he and Epstein are in the big classroom in the sky...

and Merv Griffin is still dead.