This undated photo shows Marion Bowman Jr. released by the South Carolina Department of Corrections, awaits execution on death row. (South Carolina Department of Corrections via AP)

FILE - This 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 undated photo released by the South Carolina Department of Corrections shows the room where inmates are executed in Columbus, S.C. (South Carolina Department of Corrections via AP)

This undated photo shows Marion Bowman Jr. released by the South Carolina Department of Corrections, awaits execution on death row. (South Carolina Department of Corrections via AP)

In this undated photo provided by the South Carolina Department of Corrections, viewing chairs are placed in the witness room of the execution chamber in the Broad River Correctional Institute in Columbia, S.C. (South Carolina Department of Corrections via AP)