Hazelton Prison/usbop photo

The FBI and prison officials are investigating a fatal stabbing of an inmate Sunday at the U.S. Penitentiary at Hazelton in West Virginia, the Associated Press reported.

The facility has been on lockdown since the Sunday when Jimmy Lee Wilson, 26, was stabbed to death during an altercation, AP reported. He had been serving a 130 sentence for robbing a credit union.