ADVANCE FOR USE MONDAY, JULY 31, 2017 AND THEREAFTER-This combination of photos from the Lawrence County Alabama Sheriff's Office and the Alabama Department of Corrections shows Evan Miller on Nov. 4, 2005 and later. Miller was convicted at the age of 14 for the 2003 murder of Cole Cannon. (Lawrence County Alabama Sheriff's Office, Alabama Department of Corrections/The Decatur Daily via AP)
This undated photo made available by the Alabama Department of Corrections, shows Jason Lee Jackson, an inmate at the Elmore Correctional Facility in Elmore, Ala. Jackson was charged with murder in the stabbing death of Timothy Robertson. Jackson stabbed Robertson multiple times in the prison yard, Tuesday, July 25, 2017. (Alabama Department of Corrections via AP)
This undated photo made available by the Alabama Department of Corrections shows Timothy Robertson, an inmate at the Elmore Correctional Facility in Elmore, Ala. Robertson was killed when he was stabbed multiples by another inmate in the prison yard, Tuesday, July 25, 2017. Jason Lee Jackson was charged in the murder of Robertson. (Alabama Department of Corrections via AP)
This undated photo released by the Alabama Department of Corrections, shows Robert Bryant Melson, in Atmore, Ala. Melson is scheduled to be executed June 8, 2017, in Alabama by lethal injection after being convicted of killing three fast food restaurant employees during a 1994 robbery. (Alabama Department of Corrections via AP)
FILE - This undated photo provided by the Alabama Department of Corrections shows Tommy Arthur at the Holman Correctional Facility in Atmore, Ala. The Alabama inmate who has had seven executions postponed is scheduled to be put to death by lethal injection Thursday, May 25, 2017. Arthur, now 75, was convicted in the 1982 murder-for-hire of Troy Wicker. (Alabama Department of Corrections via AP, File)
In this photo provided by the Alabama Department of Corrections, Tommy Arthur in a mugshot taken at the Holman Correctional Facility in Atmore, Ala. The Supreme Court is freeing Alabama to try again to execute a convicted killer who has been on death row for more than 30 years.The justices on Tuesday, Feb. 21, 2017, turned down an appeal from inmate Tommy Arthur. In November, the court blocked Arthur's execution as he waited in a holding cell outside the state's execution chamber. (Alabama Department of Corrections via AP)
This undated photograph provided by the Alabama Department of Corrections on Wednesday, Jan. 4, 2017, shows inmate Bobby Campbell Jr., who officials say was released by mistake in November 2016. Authorities are trying to determine the source of what they say was a fake court document that led to Campbell's release. (AP Photo/Alabama Department of Corrections)
This undated file photo provided by the Alabama Department of Corrections shows Vernon Madison, who is scheduled to be executed for the 1985 murder of Mobile police officer Julius Schulte. (Alabama Department of Corrections, via AP)