James Gandolfini, who famously played Tony Soprano on "The Sopranos", died earlier today in Italy according to TMZ.

Gandolfini is believed to have suffered a heart attack. He was 51.

Gandolfini was in Italy to attend the 59th Taormina Film Festival in Sicily -- and he was scheduled to participate in a festival event this weekend with Italian director Gabriele Muccino.

Gandolfini shot to fame playing a hitman in the 1993 hit "True Romance" ... and quickly became a Hollywood legend when he was cast as Tony Soprano in 1999. He won 3 Emmy awards for the role during the show's 6 season run.

Gandolfini also appeared in a ton of huge movies including "Get Shorty," "The Mexican" and "Zero Dark Thirty."

TMZ last spoke to Gandolfini in May in L.A. -- he was in great spirits, making funny faces and joking about a "Sopranos" movie.

Source: TMZ