"Jimmy was the spiritual core of our Sopranos family, and I am stunned at this devastating loss. He was a great talent, but an even better man. My thoughts are with his family."
Actor Denis O'Hare ?@denisohare
"So sad to hear about James Gandolfini -- a lovely man I had the pleasure of working with once. So funny. So humble. So talented."
Actor Jeff Daniels @Jeff_Daniels
"RIP James Gandolfini. A great friend."
Actress Melissa Gilbert @MelissaEGilbert
"I did a play with James Gandolfini 24 years ago in a basement under a bar in the west village. I'm pretty sure it was one of his very first acting jobs. The year I was first elected SAG prez he threw me in the air at the awards party"
Actress Tracey Fairaway ?@TraceyFairaway
"Found out my fellow cast mate James Gandolfini has died of a heart attack,, we just shot Nicole Holofcener's new film,, I can't believe it #rip James Gandolfini u were a pleasure to know & such a kind, loving, fun guy u will be forever missed. xxox we love u always"
Actor Riz Ahmed, of the upcoming HBO show "Criminal Justice" with Gandolfini, via Facebook
"Oh my god..RIP James Gandolfini. A generous, striving artist and man in his prime. A loss to our shared culture. Was set to work with him next year, feel privileged to have shared a little time with him on set. He laid on treats and shared his success with all he worked with. There would be a sushi chef when he was on set, he would pay for to treat people. He would hold out his contract til other people's were improved. He was a man of the people, a working class hero, and a gentleman. Tony Soprano is the best screen performance of all time, no one else has sustained and shouldered such complexity for so long. Feel utterly shocked and saddened."
Actor Joseph Gannascoli, played Vito Spatafore on "The Sopranos"
"Jimmy and I were not the closest of friends, but I am forever indebted to him. He came with his son and spoke at my wedding, came to my restaurant to meet fans sick as a dog in the rain and stayed for hours. He also said he would go in and talk to David Chase with me if I didn't want to play my role on the show. Just a humble and gifted actor and person."
Actor Steve Schirripa, played Bobby Baccalieri on "The Sopranos"
"Jimmy was a dear friend and like a brother to me. He was a great actor and a great father. I will miss him terribly. I am very sad."
CNN iReporter Randy Robinson, an actor on the 2006 film "Lonely Hearts"
"He was like a big funny bear. He spent some time having fun ... There was this old couch that he would toss everything and anyone off of and lay down for a much needed nap. Well, let me tell you -- he snored louder than a bear could growl. They actually had to wake him because the microphones would pick it up."
Actor and musician Steven Van Zandt ?@StevieVanZandt
"I have lost a brother and a best friend. The world has lost one of the greatest actors of all time. Maureen and I send our deepest sympathy and love to Deborah, Michael, Lily, and all of Jimmy's family.
Actress Maureen VanZandt, @MVZaGoGo, played Gabriella Dante on 'The Sopranos'
I loved James so much. He was a beautiful man and a genius. I was honored to breather the same air as him. I'll love and remember him forever.
Fan and CNN iReporter Melissa Fazli
"James is iconic. He will go down with such names as Robert Deniro, Al Pacino, Warren Beatty, Marlon Brando and Joe Pesci as the best mobster actors. His legacy as Tony Soprano will forever be in the history books. "
Actress Lindsay Lohan, ?@lindsaylohan
"James Gandolfini was a dear friend and a great man. My heart goes out to his family. He will be greatly missed."