FILE - This June 29, 2011 file photo provided by the Oklahoma Department of Corrections shows Clayton Lockett. Oklahoma prison officials halted the execution of Lockett Tuesday, April 29, 2014, after the delivery of a new three-drug combination failed to go as planned. Oklahoma Gov. Mary Fallin said Lockett had an apparent heart attack more than 40 minutes after the start of the execution. (AP Photo/Oklahoma Department of Corrections, File)
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