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FILE - This undated photo provided by the South Carolina Department of Corrections shows the state's death chamber in Columbia, S.C., including the electric chair, right, and a firing squad chair, left. (South Carolina Department of Corrections via AP, File)

FILE - This undated photo provided by the South Carolina Department of Corrections shows the state's death chamber in Columbia, S.C., including the electric chair, right, and a firing squad chair, left. (South Carolina Department of Corrections via AP, File)

This photo provided by Justice 360 shows death row inmate Richard Moore at Kirkland Reception and Evaluation Center in Columbia, S.C., Aug. 17, 2018. (Justice 360 via AP)

This photo provided by Justice 360 shows death row inmate Richard Moore at Kirkland Reception and Evaluation Center in Columbia, S.C., Aug. 17, 2018. (Justice 360 via AP)