Actor, James Gandolfini, who famously portrayed mobster Tony Soprano on HBO’s long-running series The Sopranos, passed away on June 19, 2013 in Rome. Reports are conflicting as to the cause of death right now, citing either a massive heart attack or a stroke.

Gandolfini, who hailed from Westwood, NJ, “made his bones” on the HBO mafia drama which took place in Northern New Jersey. Shock and condolences have been been pouring in on Twitter under the hashtags #JamesGandolfini and #Tony Soprano.

Cory Booker, the mayor of Newark, NJ, where Gandolfini’s character, Tony, was born and raised, tweeted: “My condolences to the family and all those who loved James Gandolfini – a true NJ Great and NJ Original. RIP.”

Some of the celebrities who tweeted their dismay are:

Robin Williams: “My thoughts and prayers go out to James Gandolfini’s family. An extraordinary actor. RIP, Mr. Gandolfini.”

Shannen Doherty: “So talented, so nice and far too young to be taken away. You will be missed Sir.”

Ed Asner: “Thoughts and prayers go out to James Gandolfini’s family. Just so f**cked.”

Debi Mazar: “Husband informed me that #JamesGandolfini just passed in Italy. I’m devastated. My condolences to his family & friends. He passed in his motherland.”

Russell Simmons: “Not Tony Soprano! Damn. Such a good guy and a great actor. James, rest in peace.”

HBO has issued a statement: We’re all in shock and feeling immeasurable sadness at the loss of a beloved member of our family. He was a special man, a great talent, but more importantly a gentle and loving person who treated everyone no matter their title or position with equal respect. He touched so many of us over the years with his humor, his warmth, and his humility. Our hearts go out to his wife and children during this terrible time. He will be deeply missed by all of us.”

The actor is survived by his wife, Deborah Lin, their 8-month-old daughter, Liliana, and a son, Michael, from his first marriage.