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



  Media gather outside the South Dakota Penitentiary on Monday, Oct. 15, 2012, in preparation for the execution of 50-year-old Eric Robert, who pleaded guilty to the April 2011 slaying of Ronald "R.J." Johnson, a prison guard. Robert is set to be the first execution in the state since 2007, and only the second in more than half a century. (AP Photo/Amber Hunt)

Media gather outside the South Dakota Penitentiary on Monday, Oct. 15, 2012, in preparation for the execution of 50-year-old Eric Robert, who pleaded guilty to the April 2011 slaying of Ronald "R.J." Johnson, a prison guard. Robert is set to be the first execution in the state since 2007, and only the second in more than half a century. (AP Photo/Amber Hunt)