Welcome Back, Kotter actor Ron Palillo died Tuesday morning of a heart attack at home near Palm Beach, Florida, TMZ reports.

Palillo, who played Horshack on the series costarring a young John Travolta during its 1975 to 1979 run, was 63.

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According to TMZ, Palillo was discovered by his longtime partner Joseph Gramm early Tuesday morning; he was rushed to the hospital and pronounced dead. A heavy smoker, the star was said to have been in good health in the weeks leading up to his unexpected passing.

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After his stint on Welcome Back, Kotter, Palillo appeared on Laverne and Shirley and voiced a character on the animated Disney series Darkwing Duck, with dozens of additional TV and film credits to his name.


This article originally appeared on Usmagazine.com: Ron Palillo, Welcome Back Kotter Star, Dies at 63: Report