Robert 'Bobby' Hegyes of 'Welcome Back, Kotter' has died

Robert “Bobby” Hegyes -- Epstein of “Welcome Back, Kotter" -- has died. First report of his death broke in the Newark Star-Ledger a little while ago. Per ABC News, citing the report:  

The show aired on ABC from 1975 to '79, and was beloved; of course, it launched one very famous career -- John Travolta's.