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.

Byron Black, 69, was executed for the 1988 South Nashville murders of his ex-girlfriend Angela Clay and her two daughters Latoya, 9, and Lakeisha, 6.

Tennessee executed death row inmate Byron Black on Tuesday despite raised concerns about his implanted heart device, which could cause a "prolonged and torturous execution."