Russell Johnson has passed away at the age of 89.

Though that name might not ring a bell, he was known to millions as “The Professor” as one of the stars of “Gilligan’s Island.”

ABC News confirms that the star died Thursday morning of kidney failure. Along with his wife, Johnson is survived by his daughter, Kim.

“He died at home, peaceful, in his sleep at 5:21am today,” his wife, Constance told ABC. “[He was] a very brave guy who knew what he wanted, and he wanted to be at home.”

Johnson starred on the comedy in the mid-‘60s as Professor Roy Hinkley, the brainy castaway who was simply called the Professor.

Aside from starring in “Gilligan’s Island” and the show’s spinoffs in the ‘70s and early ‘80s, he also starred in episodes of “Gunsmoke,” “The Twilight Zone” and many TV series.

What’s your favorite moment of The Professor of “Gilligan’s Island”? Share them with us in the comments!

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