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Actor Russell Johnson, 89, who played the brainy Professor in nearly 100 episodes of the 1960s classic TV comedy series “Gilligan’s Island,” died Thursday morning at his home in Washington state.

The cast of “Gilligan’s Island” is shown in this 1978 photo. Russell Johnson, seated on the far right, died Thursday, Jan. 16, 2014. (Credit: AP)

He died peacefully in his sleep of natural causes, said his agent, Michael Eisenstadt.

Johnson also appeared in several films, including the sci-fi movies “It Came from Outer Space” and “This Island Earth,” and he did guest appearances on numerous other series.

But he is best known for his role on “Gilligan’s Island” in which he played a professor who used his scientific knowledge to deal with the various perils the haplass castaways faced.

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“Gilligan’s Island: The Complete First Season” – Party
Actor Russell Johnson poses during the “Gilligan’s Island: The Complete First Season” DVD launch party on Feb. 3, 2004 in Marina Del Rey. (Credit: Getty Images) Inserted in the upper-left is an image of Johnson as “The Professor,” a principal character in the show. (Credit: