Carly Mallenbaum

USA TODAY

Mark Hamill is remembering his Star Wars co-star Kenny Baker, who died Saturday at age 81.

"He WAS the droid I was looking for!" wrote Hamill, aka Luke Skywalker, about his "lifelong loyal friend" Baker, who played R2-D2.

"Kenny Baker" became a national trending term on Twitter with a number of other co-stars and fans sharing their thoughts on the actor.

Kenny Baker, Star Wars' R2-D2, dies at 81