UNDATED (WKOW) -- HBO and the managers of James Gandolfini confirm the actor has died at age 51.
His managers say Gandolfini died of a possible heart attack.
He was on vacation in Italy at the time.
Gandolfini is well-known for playing mob boss Tony Soprano on HBO's "The Sopranos". He won three Emmys for the role and worked steadily in film and on stage after the series ended. He earned a 2009 Tony Award nomination for his role in "God of Carnage," and his film roles included playing Defense Secretary Leon Panetta in "Zero Dark Thirty."
Gandolfini grew up in New Jersey, and the state's governor calls the actor's death "an awful shock." Saying he was a "huge fan," Gov. Chris Christie says Gandolfini was "a fine actor, a Rutgers alum and a true Jersey guy."