By Ben Brumfield
(CNN) — James Gandolfini likely died of a heart attack, according to the head of a Rome hospital’s emergency department where the actor was taken.
Gandolfini’s managers had said they believed that a heart attack killed him Wednesday in Rome.
The body of actor James Gandolfini was transferred to a hospital morgue in Rome early Thursday, where it awaits an autopsy.
By law, medical examiners in Italy are required to carry out the postmortem 24 hours after the body’s arrival in the morgue, a hospital spokesman said.
Before Italian authorities can release his remains for transport back to the United States, the U.S. Embassy in Rome must issue a death certificate.
Gandolfini was not alive when he arrived by ambulance at the Policlinico hospital late Wednesday, said spokesman Antonio Spasola.
The star of ‘The Sopranos’ was just 51 years old.
“This is young to have a heart attack, even when you look at any pre-existing health conditions,” said CNN’s chief medical correspondent Sanjay Gupta. Usually, first heart attacks don’t strike until the victim is over 60.
But risk factors such as obesity, smoking, lack of exercise and stress can cause them to occur earlier in life, Gupta said.
Tributes poured in from colleagues, friends and fans on social media.
Edie Falco, who played Carmela Soprano in “The Sopranos,” released this statement: “I am shocked and devastated by Jim’s passing. He was a man of tremendous depth and sensitivity, with a kindness and generosity beyond words. I consider myself very lucky to have spent 10 years as his close colleague. My heart goes out to his family. … The love between Tony and Carmela was one of the greatest I’ve ever known.”
Even after Sopranos fame, he was very down to earth, said iReporter Pat Tantalo, who worked on the set of a 2006 movie Gandolfini starred in.
They exchanged telephone numbers and spent some of their evenings sitting around together on a deck by a lake smoking cigars.
“It was like we had been friends forever,” Tantalo said. Gandolfini was well-respected by his peers.
“He was a genius,” said David Chase, creator of “The Sopranos.” “Anyone who saw him even in the smallest of his performances knows that. He is one of the greatest actors of this or any time.”
Gandolfini is survived by his wife, Deborah, and their 9-month-old daughter, Liliana. He is also survived by a son, Michael, from another marriage.
TMZ is reporting that Gandolfini’s shocking death happened in the middle of a “guy’s trip” for the actor and his teenage son, Michael.
According to TMZ, Michael’s mom flew to Italy to be with her son after hearing about Gandolfini’s death.
CNN’s Hada Messia and Livia Borghese contributed to this report