Bulger is reported to have died on the very day he arrived at his new prison in West Virginia, having previously spent several years incarcerated in Florida.
Bulger was 89 years old.
In 2013, Bulger was convicted of 11 murders that occurred in the Boston-area in the 1970s and 80s.
Bulger, the model for Jack Nicholson's ruthless crime boss in the 2006 Martin Scorsese movie, "The Departed", led a largely Irish mob that ran loan-sharking, gambling and drug rackets. He was pronounced dead by the Preston County medical examiner after failed life-saving measures.No staff or other inmates were injured, the prisons bureau said.
Bulger worked almost two decades as an Federal Bureau of Investigation informant while simultaneously running the Winter Hill Gang in Boston. "Taking advantage of his brother William's stature in the Massachusetts State Senate and childhood friendships that linked him to members of the police force, Bulger helped bring down the Patriarcas, a New England organized crime family, while simultaneously building a more powerful and arguably more violent crime network of his own", according to the website.
Bulger was born September 3, 1929, in Dorchester, Massachusetts.
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Bulger used a corrupt relationship with a handful of Federal Bureau of Investigation agents and other law enforcement officers to take over a small time gang of hoodlums in his native South Boston and turn it into one of the country's most powerful criminal mobs.
He had been held in a high-security prison in the federal correctional complex at Coleman, Fla.
In one of those heartfelt letters, Bulger wrote: 'My 16 years on the run were the happiest years of my life and hers. He had a kind of Robin Hood-like image among some locals, but authorities said he would put a bullet in the brain of anyone who he even suspected of double-crossing him.
"I heard he wasn't feeling well a while back", Jackie Bulger said of Whitey.
She was sentenced to eight years in prison for helping Bulger evade the law.
Then they were busted in Santa Monica in 2011, they were found with $800,000 in cash and had 30 weapons stashed in the rental home.