Byron Lewis Black, convicted for the 1988 shooting death of his girlfriend and her two young children, was executed in Tennessee on Tuesday morning. He was 69. Black died by lethal injection at 10:43 Central time,

An inmate executed by Tennessee without deactivating his implanted defibrillator said he was hurting badly shortly after the lethal injection began, according to several witnesses.

Tennessee is gearing up for an execution that experts say would likely mark the first time a man has been put to death with a working defibrillator in his chest