Oklahoma Department Of Corrections

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This undated photo provided by the Oklahoma Department of Corrections shows Tondalao Hall. The American Civil Liberties Union said Wednesday, June 14, 2017, that it will ask an Oklahoma court to review the case of a Hall who was sentenced to 30 years in prison for failing to report the abuse of her children by her boyfriend, who received only two years behind bars for the abuse. (Oklahoma Department of Corrections via AP)

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FILE - In this Jan. 9, 2015, file photo provided by the Oklahoma Department of Corrections shows Shaun Bosse. The Oklahoma Court of Criminal Appeals on Thursday, May 25, 2017, has upheld the death penalty of Bosse, who is convicted of killing his girlfriend and her two children in 2010. The court ruled that testimony by relatives of the victims saying Bosse should receive the death penalty should not have been allowed, but was harmless error. (Oklahoma Department of Corrections via AP, File)

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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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This August 2016 photo provided by the Oklahoma Department of Corrections shows Amber Hilberling. Oklahoma prison officials say that Hilberling, who was convicted of second-degree murder in 2011 for pushing her husband to his death from the 25th floor of their apartment, died in prison Monday, Oct. 24, 2016. (Oklahoma Department of Corrections via AP)

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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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FILE - This June 29, 2011, photo provided by the Oklahoma Department of Corrections shows Charles Warner. Warner was executed Jan. 15, 2015 for the 1997 killing of his roommate's 11-month-old daughter. The Supreme Court is stepping into the issue of lethal injection executions for the first time since 2008 in an appeal filed by death row inmates in Oklahoma. The justices agreed Friday, Jan. 23, 2015, to review whether the sedative midazolam can be used in executions because of concerns that it does not produce a deep, comalike unconsciousness and ensure that a prisoner does not experience intense and needless pain when other drugs are injected to kill him. The order came eight days after the court refused to halt the execution Warner that employed the same combination of drugs. The appeal was brought to the court by four Oklahoma inmates with execution dates ranging from January to March. The justices allowed Warner to be put to death and denied stays of execution for the other three. Friday's order does not formally call a halt to those scheduled procedures. But it is inconceivable that the court would allow them to proceed when the justices already have agreed to a full-blown review of the issue. (AP Photo/Oklahoma Department of Corrections, File)

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This March 25, 2013 photo provided by the Oklahoma Department of Corrections shows Alton Nolen, of Moore, Okla. Prison records indicate that Nolen, the suspect in the beheading of a co-worker at an Oklahoma food processing plant Thursday, Sept. 25, 2014, had spent time in prison and was on probation for assaulting a police officer. (AP Photo/Oklahoma Department of Corrections)

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This photo provided by the Oklahoma Department of Corrections shows Richard Glossip. An Oklahoma court has scheduled a Nov. 20, 2014 execution date for the convicted killer while the state’s protocol is under review following a botched execution. The Oklahoma Court of Criminal Appeals on Glossip has exhausted his appeals. (AP Photo/Oklahoma Department of Corrections)

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FILE - This June 29, 2011 file photo provided by the Oklahoma Department of Corrections, shows convicted killer Charles Warner. Attorney General Scott Pruitt's office filed court documents saying it wouldn't object to a 180-day stay of execution being sought by attorneys for inmate Charles Warner while the investigation is underway. Warner was scheduled for execution on the same night last week as Clayton Lockett in what would have been the state's first double execution since 1937. But Lockett's vein collapsed during his lethal injection. (AP Photo/Oklahoma Department of Corrections, File)

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FILE - This June 29, 2011 file photo provided by the Oklahoma Department of Corrections, shows Clayton Lockett. The botched execution of Lockett, and the gruesome details of him writhing and moaning before dying of a heart attack, has outraged death penalty opponents, raised the potential of more court challenges and received international attention. (AP Photo/Oklahoma Department of Corrections, File)

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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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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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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.. (AP Photo/Oklahoma Department of Corrections, File)