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Byron Black’s Implanted Defibrillator Didn’t Fire During Execution, Early Data Shows

His legal team is seeking an autopsy report in the coming weeks to clarify his suffering under Tennessee’s pentobarbital protocol.

Relatives of the victims of convicted murderer Byron Black stay in the area reserved for pro-death penalty advocates outside Riverbend Maximum Security Institution before the execution of Black, Tuesday, Aug. 5, 2025, in Nashville, Tenn. (AP Photo/Mark Humphrey)
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Overview

  • Initial evaluation of Black’s implantable cardioverter defibrillator data confirms the device did not deliver any shocks during his August 5 lethal injection.
  • All seven media witnesses agreed Black displayed signs of distress and he was heard saying “It’s hurting so bad” as pentobarbital flowed.
  • Black’s attorneys have filed public records requests for his execution electrocardiograph readings and expect an autopsy report within eight to twelve weeks.
  • The case has prompted a first-of-its-kind challenge to Tennessee’s single-drug pentobarbital protocol over allegations of a “high risk of a torturous death.”
  • Last week, the Tennessee Supreme Court overturned a trial judge’s order to deactivate Black’s defibrillator before execution, fueling ongoing Eighth Amendment cruelty debates.