McALESTER, Okla. — In its first lethal injection since a botched one last spring, Oklahoma executed a convicted killer with a three-drug method also used by Florida for an execution the same night.

In an execution Thursday that lasted 18 minutes, Oklahoma inmate Charles Frederick Warner showed no physical signs of distress after the lethal drugs were administered, although he did say, “My body is on fire.” He was declared dead at 7:28 p.m.