Judge Denise Casper added extra five years to his sentence and ordered Bulger to pay USD 19 million in restitution for his victims.
At the age of 84, Bulger -- a fugitive for 16 years before his arrest in California in 2011 -- is likely to die in prison.
Casper told the US district court in Boston that the nature of Bulger's crimes spanning 40 years was "unfathomable."
"The motivation of your entire criminal history is based on money. It takes no business acumen to stick a gun in somebody. It's what anyone can get at the end of gun," she said.
"Call it what you want, but in my estimation you received a fair trial," she said.
When asked if he understood, Bulger uttered just one word: "Yes." His lawyers said that he would appeal the conviction.
"I think Jim is pleased that he held to his principles and chose not to react. He is very disciplined," his lawyer Jay Carney told reporters.
A jury in August found Bulger guilty on 31 counts, including 11 of the 19 murders for which he had been charged. The only count for which he was not convicted was an extortion charge.
Bulger attorney Hank Brennan said the mobster would appeal the conviction.
The trial, which began June 4, featured 72 witnesses, 840 exhibits and chilling testimony worthy of a pulp novel.
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