In this Oct. 9, 2014 file photo, Department of Corrections officials are pictured in the witness room at right, outside the newly renovated death chamber at the Oklahoma State Penitentiary in McAlester, Okla. With executions in Oklahoma on hold amid a constitutional review of its lethal injection formula, Republican legislators are pushing to make Oklahoma the first state in the nation to allow the use of nitrogen gas to execute death row inmates. (AP Photo/Sue Ogrocki, File)