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MEMPHIS, Tenn. — The Hardeman County Correctional Facility in Whiteville, Tennessee is on lockdown after an inmate’s death Saturday.

A spokesperson with operator CoreCivic said an inmate called for assistance with his cellmate around 3 p.m. When a guard arrived, the inmate was found unconscious in the cell.

Staff initiated life-saving measures until medical staff arrived. The prisoner was taken to an outside hospital where he was later pronounced dead, according to CoreCivic.

The Tennessee Department of Correction is investigating.