The latest on Oklahoma's prisons director resigning (all times local):

4:20 p.m.

The director of Oklahoma's prison system who presided over two botched lethal injections is resigning amid an investigation into what went wrong with the executions.

Department of Corrections Director Robert Patton announced Friday that he will resign effective Jan. 31. He will begin taking accrued leave on Dec. 25.

Patton said in a news release he had accepted a position in Arizona to be closer to his family.

Last month, Patton appeared before a multicounty grand jury that is investigating how the wrong lethal injection drugs were used during an execution in January. The same wrong drugs were delivered to the prison just hours before an execution was to be carried out in September.

Patton had been on the job a few months when execution of Clayton Lockett was botched in April 2014.