A grand jury investigating last year’s botched executions in Oklahoma released a damning report on Thursday documenting the failures that led officials to acquire and administer the wrong lethal drug.

Oklahoma’s ability to carry out executions according to its own laws is even more suspect than it originally seemed. According to a report in The Oklahoman, a man named Charles Warner was killed in January using potassium acetate—the same incorrect drug that led to the postponement of Richard Glossip’s death last week.

Following the botched execution of Clayton Lockett last week, Oklahoma's attorney general has agreed a to six-month stay of execution for death-row inmate Charles Warner.