In 2013, the notorious Boston mob boss was convicted of participating in 11 murders that spanned Florida, Oklahoma, and MA. It's unclear if authorities have determined who played a role in the murder.
Life-saving measures were initiated on Bulger, 89, after he was found at 8:20 a.m.at the Hazelton federal prison in Bruceton Mills. An investigation by the FBI into the incident is ongoing.
He was previously relocated from a Florida prison to a facility in Oklahoma. His inmate number was 02182-748.
Bulger was born in South Boston during the Depression, who got the nickname "Whitey" growing up for his blonde hair. An official had said that a person was killed but couldn't confirm the identity at the time.
The fourth victim was Michael Donahue, an innocent bystander who happened to be sitting in a auto with Halloran when Bulger opened fire with a machine gun, in broad daylight, on a busy South Boston street, yards from the shiny new courthouse where his two-month trial took place. The bureau added him to its "10 Most Wanted Fugitives" list in 1999, offering $250,000 for information leading to his arrest.
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"Although there are those who doubted our resolve, it never wavered", Boston FBI Special Agent Richard DesLauriers said in announcing the arrests.
A federal jury convicted had Bulger that year of 31 counts, including racketeering, extortion, money laundering, drug dealing and weapons possession. "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. He was sentenced almost five years ago to two consecutive life sentences plus five years.
According to the Boston Globe, a fellow inmate with Mafia ties is being investigated for the slaying at the US Penitentiary Hazelton. "Today's conviction does not alter that harm, and it doesn't lessen it". His story also became the subject of the 2015 Johnny Depp movie "Black Mass".
In one of those heartfelt letters, Bulger wrote: 'My 16 years on the run were the happiest years of my life and hers.