FILE - This 1978 file photo originally from ABC shows cast members, from left, Lawrence Hilton-Jacobs as Freddy Washington, Ron Palillo as Arnold Horshack, Robert Hegyes as Juan Epstein, foreground, John Travolta, rear, as Vinnie Barbarino from the television sitcom "Welcome Back, Kotter." Palillo, best known as the nerdy high schooler Arnold Horshack on "Welcome Back, Kotter," died Tuesday, Aug. 14, 2012, in Palm Beach Gardens, Fla., of an apparent heart attack. He was 63. (AP Photo/ABC, file)

Associated Press
FILE - This 1978 file photo originally from ABC shows cast members, from left, Lawrence Hilton-Jacobs as Freddy Washington, Ron Palillo as Arnold Horshack, Robert Hegyes as Juan Epstein, foreground, John Travolta, rear, as Vinnie Barbarino from the television sitcom "Welcome Back, Kotter."  Palillo, best known as the nerdy high schooler Arnold Horshack on "Welcome Back, Kotter," died Tuesday, Aug. 14, 2012, in Palm Beach Gardens, Fla., of an apparent heart attack. He was 63. (AP Photo/ABC, file)
FILE - This 1978 file photo originally from ABC shows cast members, from left, Lawrence Hilton-Jacobs as Freddy Washington, Ron Palillo as Arnold Horshack, Robert Hegyes as Juan Epstein, foreground, John Travolta, rear, as Vinnie Barbarino from the television sitcom "Welcome Back, Kotter." Palillo, best known as the nerdy high schooler Arnold Horshack on "Welcome Back, Kotter," died Tuesday, Aug. 14, 2012, in Palm Beach Gardens, Fla., of an apparent heart attack. He was 63. (AP Photo/ABC, file)
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