An autopsy shows that Oklahoma used the wrong drug when it executed an inmate in January.
The Oklahoman reported Thursday that corrections officials used potassium acetate — not potassium chloride, as required under the state's protocol — to execute Charles Frederick Warner.
Last week, Gov. Mary Fallin issued a last-minute stay of execution for inmate Richard Glossip after officials discovered that potassium acetate had been delivered.
The autopsy says the items used in Warner's execution included 12 empty vials labeled "single dose Potassium Acetate Injection."
Potassium chloride, which stops the heart, is the final drug in the state's protocol.
After receiving the first drug in the series, midazolam, Warner said, "My body is on fire," but showed no other signs of distress and was pronounced dead after 18 minutes.