Robert Guillaume radiated such warmth, light, dignity, and above all, class.

That smile and laugh touched us all.

RIP to the best boss ever, wrote Charles on Twitter.

A Raisin In The Sun Opening Night Performance And After Party

Credit: Michael Kovac/WireImage

Saw him play Nathan Detroit on Broadway in 1976.

Made me want to be an actor.

It was a thrill to work w him on SN, read Malinas tweet.

Check out some of the other celebrity reactions to Robert Guillaumes death below.