Article Photos: S. Dakota executes inmate who killed prison guard



  FILE - In this Oct. 14, 2011, file photo Eric Robert appears in a Sioux Falls, S.D. court. Robert is scheduled to be executed by lethal injection Monday, Oct. 15, 2012, South Dakota's first execution in five years. Robert pleaded guilty in the April 12, 2011, slaying of a prison guard during a failed escape attempt and asked to be put to death, saying he would kill again. (AP Photo/Argus Leader, Emily Spartz, File)

FILE - In this Oct. 14, 2011, file photo Eric Robert appears in a Sioux Falls, S.D. court. Robert is scheduled to be executed by lethal injection Monday, Oct. 15, 2012, South Dakota's first execution in five years. Robert pleaded guilty in the April 12, 2011, slaying of a prison guard during a failed escape attempt and asked to be put to death, saying he would kill again. (AP Photo/Argus Leader, Emily Spartz, File)