Ron Palillo, Aug. 14, age 63: Ron's most memorable role was Arnold Horshack, known for his "Oooh! Oooh!" catchphrase, on '70s sitcom "Welcome Back, Kotter." He later taught at a high school in West Palm Beach, Fla. He died of a heart attack.
BING: Watch clips of Ron on 'Kotter'
FIND: What did John Travolta have to say about his fellow Sweathog?
SEARCH: See pictures of the 'Kotter' cast back in the day
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