Byron Black noted intense pain during his lethal injection death earlier this week, with some wondering if it was because his defibrillator wasn’t deactivated.

Tennessee death row inmate Byron Black's defibrillator did not cause any direct complications during his execution this week, his attorney said.

Convicted murderer Byron Black was put to death by lethal injection Tuesday, Aug. 5, in what experts believe is the first execution of a death row inmate with a working heart-regulating device.