Convicted Boston mob boss James "Whitey" Bulger has been moved from a federal prison in Florida to a transfer facility in Oklahoma, according to the U.S. Bureau of Prisons website.
The 89-year-old is serving a life sentence for 11 murders and other related crimes.
The U.S. Bureau of Prisons does not list when Bulger was moved or a reason for transferring him from the prison in Sumter County, Florida, where he has been since September 2014. Prior to that, Bulger was held at a prison in Tucson, Arizona.
Bulger was the head of Boston's Irish mob and an FBI informant. He was convicted of gangland crimes in the 1970s and '80s and sentenced to life in prison after a jury convicted him in 2013.
His case became an embarrassment for the FBI as corrupt agents accepted bribes and protected him. Bulger was a fugitive for 16 years until his 2011 arrest in California.
In October 2016, the Supreme Court turned away Bulger's appeal of his racketeering convictions and life sentence.
The justices did not comment on leaving in place Bulger's convictions for playing a role in the 11 murders.
Bulger argued that the judge at his trial should have let him tell the jury that a now-dead federal prosecutor had granted him immunity from prosecution. The judge said Bulger hadn't offered hard evidence that such an agreement existed.
Bulger also contended that federal prosecutors failed to disclose "promises, rewards and inducements" made to John Martorano, a hit man who testified against the Boston gangster at his trial.