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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 South Carolina Dept. of Corrections shows Richard Moore, who was sentenced to death in the September 1999 killing of convenience store clerk. ( South Carolina Dept. of Corrections via AP)

This photo provided by South Carolina Dept. of Corrections shows Richard Moore, who was sentenced to death in the September 1999 killing of convenience store clerk. ( South Carolina Dept. of Corrections via AP)