Charlie Sheen has joined countless celebrities and comedians in mourning the loss of Patrice O'Neal, the stand-up comic who died on Nov. 29 after struggles with diabetes and a stroke.

Sheen met O'Neal when the latter participated in Sheen's Comedy Central Roast on Sept. 10, 2011. At the celebrity roast, O'Neal and Sheen traded wisecracks, with the stand-up comic mocking Sheen's playboy lifestyle and the actor making O'Neal the butt of many jokes about diabetes.

Sheen: O'Neal A Brilliant Man

Taking to Twitter, Sheen was far more reverential towards the dead comedian than he had been during his Comedy Central Roast. He tweeted a link to a full statement on O'Neal's death, calling him a brilliant man and expressing his sympathies to the comedian's friends and family:

The entertainment world as well as the world at large lost a brilliant man today. Patrice had that rare ‘light’ around him and inside of him.

I only knew him for the few days leading up the Roast, Charlie Sheen wrote. Yet I will forever be inspired by his nobility, his grace and his epic talent. My tears today are for the tremendous loss to his true friends and loving family.”

Celebrities Take to Twitter

Sheen was not the only one to use Twitter to mourn Patrice O'Neal. Countless other celebrities, including fellow comedians, posted tweets expressing their admiration or trading memories of the hilarious, often controversial comic.

Below, some of the most recent Twitter posts by celebrities on Patrice O'Neal:

Donald Glover [Community TV star and stand-up comic]:  f* of the funniest and smartest comedians ever. Rest in Peace Patrice O'Neal.

Seth Myers [head writer for SNL]:  RIP Patrice O'Neal. A day spent watching clips of him on-line is a day well spent.

Questlove [DJ and drummer for The Roots on Late Night with Jimmy Fallon]:  so grateful i got to see Patrice Oneal do his last NYC gig. man this is so devastating. he truly was one of my favorite comics. RIP Patrice.

Joe Buck [Emmy-winning sportscaster]:  I watched Elephant in the Room LAST NIGHT and I just read he died.. Wow.. RIP to Patrice O'Neal .. #RIPPATRICE #thatsabadone

Jim Gaffigan [comedian and actor]:  RIP Patrice O’Neil. Undeniably brilliant.

Kevin Hart [actor and stand-up comic]:  RIP Patrice O’Neil. Undeniably brilliant.

Doug Benson [stand-up comic and HV1 contributor]:  A sad day for comedians and comedy in general. #RIPPATRICE