FILE - This June 29, 2011, photo provided by the Oklahoma Department of Corrections shows Charles Warner, who was executed on Jan. 15, 2015 for the 1997 killing of his roommate's 11-month-old daughter. The Oklahoman reported Thursday, Oct. 8, 2015 that corrections officials used potassium acetate, not potassium chloride, as required under the state's protocol, to execute Warner.(AP Photo/Oklahoma Department of Corrections, File)
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