WEST VIRGINIA — Reports say Boston mobster James "Whitey" Bulger has been found dead at a federal prison in West Virginia.

NBC News says Bulger's body was found behind bars shortly after he was transferred to USP Hazelton, a high-security prison.

There are several unconfirmed reports Bulger was murdered.

Bulger had been convicted of killing at least 11 people and was serving a life sentence. He was on FBI's Most Wanted List for 16 years until his 2011 arrest in Santa Monica, California.

The mobster was just moved from a prison in Florida to a transfer facility in Oklahoma City.