An Ohio killer has been put to death with a type of lethal injection never before tried in a US execution.
Dennis McGuire received the death penalty for the 1989 rape and fatal stabbing of Joy Stewart, a pregnant woman, in Preble County in western Ohio.
State officials used intravenous doses of two drugs, the sedative midazolam and the painkiller hydromorphone, to put McGuire to death.
McGuire appeared to gasp several times during the more than 15 minutes it appeared to take him to die.
It was one of the longest executions since Ohio resumed capital punishment in 1999.
Officials opted for the new lethal injection method after supplies of the state's previous drug dried up.
Prior to the execution, McGuire's lawyers warned that he was at substantial risk of a medical phenomenon known as air hunger, which would cause him to experience terror as he strained to catch his breath.
Ohio officials presented counter evidence disputing the air hunger risk.
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Wonder if the terror he experienced matched that of the pregnant woman he raped and fatally stabbed.