Ron Palillo; played nerd on ‘Welcome Back, Kotter’

Ron Palillo, the actor best known as the nerdy high school student ­Arnold Horshack on the 1970s sitcom ‘‘Welcome Back, Kotter,’’ died Tuesday in Palm Beach Gardens, Fla. He was 63.

Mr. Palillo apparently suffered heart attack at his home about 4 a.m., said Karen Poindexter, a close friend of the actor. He was pronounced dead at Palm Beach Gardens Medical Center.

Mr. Palillo was inextricably linked with the character he played from 1975 to 1979 on ‘‘Kotter,’’ the ABC situation comedy, in which the title character returns to his Brooklyn alma mater to teach a group of lovable wiseguys known as the Sweathogs. Horshack was the nasally teen who yelped, ‘‘Oooh, ooh,’’ and shot his hand skyward whenever Kotter posed a question.

The show was a ratings success and a pop cultural phenomenon, injecting smart-Alec phrases such as ‘‘up your nose with a rubber hose’’ into the mainstream and propelling costar John Travolta to stardom. But the series only lasted as long as a high school education and its end, for Mr. Palillo, brought difficulty.

He said he felt exiled throughout the 1980s, unable to find parts, sinking into depression, and rarely venturing from his apartment. When offers did come, he felt typecast as Horshack.

‘‘While I loved him — I really loved him — I didn’t want to do him forever,’’ he told the Birmingham News in 1994.

Ronald Paolillo was born April 2, 1949, in Cheshire, Conn., eventually dropping the first ‘‘o’’ from his surname. His father died of lung cancer when he was 10, and he developed a stutter. His mother thought getting him involved in a local theater might help.

He fell in love with the stage and overcame his speech imped­iment.

He attended the University of Connecticut and earned parts in Shakespearean productions before his big break.

When he auditioned for ‘‘Kotter,’’ he thought he would be passed over for others who had more of a tough-guy New York look. He said his dying father’s voice inspired his character’s trademark wheezing laugh, and he said Horshack tapped into feelings any teenager could relate to.

‘‘I think he was the smartest kid in school,’’ he told the Miami Herald in 2009. ‘‘He was giving up his aptitude in order to be liked. Then and now, that is a very common thing in teenagers.’’

Mr. Palillo went on to get a host of bit parts in shows from ‘‘The Love Boat’’ to ‘‘Cagney and Lacey’’ to ‘‘The A-Team,’’ and played himself for a time on the series ‘‘Ellen.’’ But ‘‘Kotter’’ remained his best-known acting part, and he focused on stage directing and writing.

His last act in life mirrored his most famous one, in a real-life classroom instead of one at the fictional James Buchanan High School. Mr. Palillo taught acting at G-Star School of the Arts, a high school in West Palm Beach. He was due to return for the school year Tuesday morning, Poindexter said, and classes were to resume next week.

Mr. Palillo leaves his partner of 41 years, Joseph Gramm; two brothers, and a sister. Poindexter said that while her friend might, at times, have resented the shadow Horshack cast over him, he remained fond of the character and knew the part was always more of a blessing than a curse.

He remained close to his costars, she said, and knew how closely fans related to the characters.

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