We've got some sad news to deliver: Windell D. Middlebrooks passed away on Tuesday (Mar. 10) at the age of 36.

The actor starred in a series of Miller Hill Life ads and appeared in shows like "Scrubs" and "Body of Proof." But he is perhaps best known by younger TV viewers for his recurring role as Kirby Morris on Disney Channel's "The Suite Life on Deck," the sequel series to "The Suite Life of Zack & Cody."

Many of Middlebrooks' "Suite Life" co-stars have taken to social media to mourn the loss of their friend and colleague.

Dylan Sprouse captioned an Instagram photo of Middlebrooks' Miller Life bobblehead: "It was a pleasure to know ya big guy. I'll always have the laughs, this souvenir, and all the good moments we shared on the set. You were a bundle of joy to know and the world will be amiss without you. Rest in peace Windell."

Sprouse's twin brother Cole, Brenda Song, and Debby Ryan also shared messages in memory of the actor.

And they're not the only ones. So many fans of "The Suite Life" have tweeted about Middlebrooks' passing that "RIP Kirby" was one of the top-trending topics in the United States by the night of his passing. Clearly, he will be missed.