Stephen Shortridge as Beau De Labarre, Lawrence Hilton Jacobs as Freddy "Boom-Boom" Washington, Ron Palillo as Arnold Horshack, John Travolta as Vinnie Barbarino, Robert Hegyes as Juan Epstein, and Gabe Kaplan as Gabe Kotter (l-r) in scene from television show "Welcome Back, Kotter."

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Actor Ron Palillo in 2009.

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Funeral services for Ron Palillo, known best as TV nerd Arnold Horshack, are planned for for 2 p.m. today.

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Ron Palillo participates in the American Museum Of The Moving Image Salute To John Travolta at the Waldorf Astoria Hotel December 5, 2004 in New York City.

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Ron Palillo performs 'Adelaide's Lament' during the 2009 Broadway Backwards at the American Airlines Theatre on February 9, 2009 in New York City. 

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Actor Ron Palillo performs 'Adelaide's Lament' during the 2009 Broadway Backwards at the American Airlines Theatre on February 9, 2009 in New York City. 

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Actors Michael Urie, Ron Palillo and Becki Newton attends the 2009 Broadway Backwards after party at the American Airlines Theatre on February 9, 2009 in New York City. 

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Actress Rita Mckenzie poses with Ron Palillo, actor at the AOL and Warner Bros. Launch of In2TV at the Museum of TV & Radio on March 15, 2006 in Beverly Hills, California. 

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Ron Palillo, Barry Williams, Alison Arngrim, Dawn Wells, Jimmie Walker, Jerry Mathers, William Katt and Bernie Kopell pose for a portrait during the 6th annual 'TV Land Awards' held at Barker Hangar on June 8, 2008 in Santa Monica, California.

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Actor Ron Palillo arrives at the AOL and Warner Bros. Launch of In2TV at the Museum of TV & Radio on March 15, 2006 in Beverly Hills, California.

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Actor Ron Palillo poses with George Lopez,actor at the AOL and Warner Bros. Launch of In2TV at the Museum of TV & Radio on March 15, 2006 in Beverly Hills, California.  

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Actors Michael Urie, Ron Palillo and Becki Newton attends the 2009 Broadway Backwards after party at the American Airlines Theatre on February 9, 2009 in New York City. 

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