Russell Johnson, "The Professor" from Gilligan's Island died on Thursday in Washington State. He was 89-years-old.

Johnson's Gilligan's Island co-star Dawn Wells, who we all know as Mary Ann from the show, announced his death on her Facebook page with a photo of her, Johnson, and Bob Denver.

Here's video of Johnson discussing some of his favorite "GI" episodes.

Johnson was a decorated veteran of World War II. Out of High School he joined the U.S. Army Air Forces and flew 44 combat missions as a bombardier in a B-25.

Before his time as Professor Roy Hinkley on Gilligan's Island, Johnson appeared in a couple of movies and television episodes of The Twilight Zone, and The Outer Limits.

After Gilligan's Island, Johnson appeared in episodes of Gunsmoke, Death Valley Days, Lassie, Ironside and The F.B.I.  He also had a guest part in the series "Dallas".  Also, he once appeared in an episode of "Newhart" as a guy watching "Gilligan's Island".

Johnson leaves behind his wife Connie, and his daughter Kim. He was preceded in death by his son David.