Ohio has executed a convicted killer through the first U.S. lethal injection using a single drug, a longer but supposedly less painful method than previous executions with three drugs.

Kenneth Biros was pronounced dead at 11:47 on Tuesday (1647 GMT), about 43 minutes after he entered the death chamber at the Southern Ohio Correctional Facility in Lucasville.

Ohio changed its execution method from three drugs to a single anaesthetic following a failed attempt at putting a different inmate to death in September. Other states still use a combination of three drugs.

Biros was sentenced to die for killing a woman in 1991, then scattering her body parts in Ohio and Pennsylvania.

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