Celebrities Mourn Michael Clarke Duncan on Twitter

Celebrity friends and admirers are taking to Twitter to pay tribute to actor Michael Clarke Duncan, who passed away September 3 at Cedars-Sinai Medical Center in L.A.

The 54-year-old Green Mile star is survived by his fiancee, two-time Apprentice contestant Omarosa Manigault, 38.

"I am terribly saddened at the loss of Big Mike," Duncan's former costar, Tom Hanks, 56, tells Entertainment Tonight in a statement. "He was the treasure we all discovered on the set of The Green Mile. He was magic. He was a big love of man and his passing leaves us stunned."

Mario Lopez: "R.I.P Michael Clarke Duncan. One of the nicest & most professional guys I've had the pleasure of knowing. So sad. #ClassAct"

Michael Strahan: "RIP to my friend Michael Clarke Duncan. A kind and gentle Giant. A friend that will be missed!! #prayers"

Niecy Nash: "Rip Michael Clarke Duncan. We shared sum great times! C u on the other side friend. @OMAROSA praying 4 u & the fam"

Jordin Sparks: "RIP Michael Clarke Duncan. Thank you for being so kind to me & for sharing your talent with the world. You will be truly missed."

Gabrielle Union: "Such a sweet, kind man :("

Rosario Dawson: "oh no! Michael Clark Duncan was such a lovely sweetheart! Too young!"

Wendy Williams: "Rest in peace Michael Clarke Duncan."

Jamie Kennedy: "MCD is dead? Dam I use play ball with him. Heartfelt prayers to your and your family. The kindest soul. Big man makes bigger angel."