The Tennessee Bureau of Investigation is looking into what led up to an inmate being killed at Northeast Correctional Complex in Mountain City. Investigators say 24-year-old Timothy Tillery Jr. of Knoxville was pronounced dead Saturday morning after his body was found inside the prison. Tennessee Department of Correction officials say Tillery had been involved in an “altercation” with several inmates. Details of the altercation, and of Tillery’s death, have not been released. Investigators are treating the death as a homicide.