FILE - This June 29, 2011, file photo provided by the Oklahoma Department of Corrections, shows Clayton Lockett, who was executed with the use of the sedative midazolam on April 29, 2014. Lockett's execution left him writhing and clenching his teeth on the gurney inside the death chamber at the Oklahoma State Penitentiary in McAlester, leading prison officials to halt the proceedings before his eventual death about 43 minutes after the procedure began. Questions about whether midazolam can prevent prisoners from suffering while they die have persisted since several states in 2014 began using the drug as part of their lethal injection protocols. (Oklahoma Department of Corrections via AP, File)
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