Bulger had just been moved to the Hazleton facility where he was found.
Corrections officials relocated the 89-year-old from a temporary stay at a facility in Oklahoma to the high-security USP Hazelton in Bruceton Mills, W.Va., on Monday. In 2013, Bulger was convicted of various crimes, including being linked to 11 murders.
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While she was given eight years behind bars, Bulger was sentenced to life in prison.
The Federal Bureau of Prisons online inmate log had listed Bulger as an inmate there early Tuesday morning, but by the afternoon he was no longer there. 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.
He went on the run with his girlfriend Catherine Greig, ending up in Santa Monica, California. One tipster insisted spying Bulger inside a Boston movie theater in 2006, watching the Martin Scorsese movie "The Departed" - where Jack Nicholson played a mob boss based on the fugitive son of South Boston.
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Update: According to TMZ, Bulger's death is being treated as a homicide.
Bulger, 89, who had eluded federal authorities for more than 16 years before his arrest in June 2011, was serving a life sentence for a litany of crimes, including his role in 11 murders.
"Bulger embarked upon a life of crime at the age of 14 and had become a prominent figure in Boston's organized crime scene by the late 1970s". But in his case, it was never clear who was informing to who.
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Most recently, he was portrayed by Johnny Depp in the 2015 movie Black Mass, which documented his life story as a gangster and longtime Federal Bureau of Investigation informant.