The famous Boston gangster James (Whitey) Bulger, who led a double life as an FBI informant and was once one of America’s most wanted criminals, was found dead in prison on Tuesday, law enforcement officials said.

The body of 89-year-old Balzher was found in a prison in West Virginia.. The US Federal Bureau of Prisons stated that the FBI is investigating into the death.

The Boston Globe, a newspaper that had been tracking the criminal life of a gangster for a long time — all 16 years while he was on the run, wrote that investigators were exploring the possibility of another prisoner in the prison associated with the Mafia in the death of Bulger..

Since 2013, Bulger was serving a life sentence. He was convicted of 11 murders, as well as other crimes, including racketeering. Bulger is known to have killed potential witnesses of his crimes and resorted to the services of corrupt law enforcement officers..

It is believed that Bulger was the prototype of Frank Costello - one of the main characters of the film "The Departed", directed by Martin Scorsese..