UPDATE: Whitey Bulger, Boston gangster, killed in West Virginia Prison

FILE - This June 23, 2011, file booking photo provided by the U.S. Marshals Service shows James "Whitey" Bulger. Bulger died in federal custody after being sentenced to spend the rest of his life in prison. Officials with the Federal Bureau of Prisons say he died Tuesday, Oct. 30, 2018. (U.S. Marshals Service via AP, File)

BOSTON (AP) — James “Whitey” Bulger, the murderous Boston gangster who benefited from a corrupt relationship with the FBI before spending 16 years as one of America’s most wanted men, was slain in federal prison. He was 89.

Bulger was found unresponsive Tuesday morning at the U.S. penitentiary in West Virginia where he’d just been transferred, and a medical examiner declared him dead shortly afterward, according to the Federal Bureau of Prisons.

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 also was an FBI informant who ratted on the New England mob, his gang’s main rival, in an era when bringing down the Mafia was a top national priority for the FBI.

Bulger fled Boston in late 1994 after his FBI handler, John Connolly Jr., warned him he was about to be indicted. With a $2 million reward on his head, Bulger became one of the FBI’s “Ten Most Wanted” criminals, with a place just below Osama bin Laden.