Don Rickles died yesterday morning at his home in Los Angeles as a result of kidney failure.
"He was called 'The Merchant of Venom,' but in truth, he was one of the kindest, caring and most sensitive human beings we have ever known. We are devastated and our world will never be the same. We were totally unprepared for this."
Rich Little stated:
"Having done 24 Dean Martin roasts, I know without a doubt that Don Rickles was the greatest comedian of all time. There were few, if any, that were quicker than Don. He didn't think of the next line, he would use, he was already thinking of the line after that. There were many times on the roast that I literally fell out of my chair laughing. In private life, Don was a very nice man. There will never be another man like him.''
Other stars took to Twitter.
"We lost a great one," Sandra Bernhard wrote. "#DonRickles fast furious brilliant for decades the definition of genius."
Piers Morgan called Don ''one of the funniest men who ever lived'' while Dean Cain said he was ''honoured'' to have met him.
Larry King called him a ''national treasure'' who kept him laughing throughout their 58 years of friendship.
Jimmy Kimmel tweeted a photo of himself with Rickles, and wrote that 90 years ''wasn't enough.'' He added: ''One of the sweetest and most lovely people I had the pleasure of knowing.''