Sixty-one-year-old Harry Mitts Jr. died Wednesday by lethal injection of the powerful sedative pentobarbital at the state prison in Lucasville.
Ohio's supply of pentobarbital is expiring. The state expects to announce its new execution method by Oct. 4.
Mitts was convicted of aggravated murder in the rampage against suburban Cleveland neighbors and police officers. He acknowledged killing a neighbor's black boyfriend and a white Garfield Heights police sergeant who responded.
The Ohio Parole Board and Republican Gov. John Kasich had denied Mitts' pleas for mercy. Mitts said he found God in prison after receiving a Bible from the slain officer's family.