Russell Johnson, probably best known for playing “The Professor” on the classic “Gilligan’s Island,” passed away this morning. He was 89.

His “Island” costar Dawn Wells expressed her grief over the loss of her friend:

We hope she can draw comfort from all the good memories.

RIP, Professor. We send our thoughts and prayers to Johnson’s loved ones.

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Related:

‘Amazing, humble patriot’: Late ‘Gilligan’s Island’ star Russell Johnson was also a WWII hero