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. Byron Black was put to death despite uncertainty about whether the device would shock his heart when the lethal chemicals took effect.

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

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. Byron Black was put to death despite uncertainty about whether the device would shock his heart when the lethal chemicals took effect.