Tennessee’s prisons chief is resigning after failed execution of Christa Pike CTV NewsOpinion | I Consulted With Christa Pike’s Death Row Team. I Knew This Could Happen. The New York TimesChrista Pike still unconscious after failed Tennessee execution, lawyer says The Globe and MailChrista Pike ‘May Never Recover’ Following Botched Lethal Injection Attempt, Lawyer Says People.comPentobarbital, the drug used in Tennessee’s failed execution, has come under past scrutiny AP News