McALESTER, Okla. (AP) — An inmate already serving a life sentence for a murder conviction has been charged with strangling his cellmate with a sheet.

McALESTER, Okla. (AP) — An inmate already serving a life sentence for a murder conviction has been charged with strangling his cellmate with a sheet.

The Oklahoman reports (http://bit.ly/1b8XLkj) that 48-year-old Mikell P. Smith was charged in Pittsburg County District Court with second-degree murder in the July 19 death of 43-year-old Timothy Hale.

Hale and Smith were cellmates at the Oklahoma State Penitentiary in McAlester, where both were serving sentences of life without parole for first-degree murder convictions. Smith also is serving a second life sentence for murder in the death of another inmate and a 500-year sentence for the near-fatal stabbing of a corrections officer.

Smith was on death row at one point, but that sentence was overturned on appeal.