Florida executed a man using the same three-drug combination, yesterday evening.
Charles Frederick Warner's execution for the 1997 killing of an 11-month-old girl in Oklahoma City lasted 18 minutes. Prison officials declared him dead at 0128 GMT Friday.
Meanwhile, officials in Florida announced the death of Johnny Shane Kormondy at 0116 GMT Friday for killing a man in 1993 in Pensacola. The executions, which occurred 12 minutes apart, were both delayed over court questions concerning the drugs used in the punishments.
After the first drug, the sedative midazolam, was administered and a microphone inside the death chamber was turned off, Warner said, "My body is on fire." But he showed no obvious signs of distress.
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Witnesses said they saw slight twitching in Warner's neck about three minutes after the lethal injection started. The twitching lasted about seven minutes until he stopped breathing.
"Because Oklahoma injected Mr. Warner with a paralytic tonight, acting as a chemical veil, we will never know whether he experienced the intense pain of suffocation and burning that would result from injecting a conscious person with rocuronium bromide and potassium chloride," Cohen said in a statement.
Gov. Mary Fallin issued a statement praising the professionalism of the prison staff.
"Justice was served tonight as the state executed Charles Warner for the heinous crime of raping and murdering an infant," Fallin said.
The execution came after a divided U.S. Supreme Court in a 5-4 ruling said it wouldn't consider whether a sedative given to the inmate would be strong enough to render him so unconscious that he wouldn't feel other drugs stop his lungs and heart.
Warner, 47, was originally scheduled to be executed in April on the same night as Clayton Lockett, who began writhing on the gurney, moaning and trying to lift his head after he'd been declared unconscious.