Melissa Gilbert reunited with her Little House on the Prairie co-star, Dean Butler, to pay tribute to their late friend, Michael Landon , who portrayed Charles "Pa" Ingalls in the hit '70s series. Melissa, who played Laura Ingalls Wilder , and Dean, her on-screen husband, took to Instagram to share a joint message to raise awareness of pancreatic cancer, from which Michael died in 1991. He tragically passed away just three months after publicly announcing his diagnosis, leaving behind his nine children.

"Michael wasn't just my co-star. He was my mentor, my friend and the closest thing to family I've ever had," Melissa wrote, in collaboration with Pancreatic Cancer Action Network. "Watching him taken by pancreatic cancer so quickly was one of the hardest things I've ever faced.

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