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Ron Palillo

Ron Palillo, an actor whose signature role was Arnold Horshack (above, third from left), a teenager with an infectious laugh in the 1970s TV sitcom "Welcome Back, Kotter," died Aug. 14, 2012. He was 63. Photos | 'Welcome Back Kotter': Where are they now? | Notable deaths of 2011 Kathy Bates / Handout; Nina Prommer / EPA
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