The high court put the execution on hold while it reviews the case.
"I believe it’s very likely that, at some point, Oklahoma has executed an innocent person.”
The state's attorney general called some corrections employees "careless" in how they carried out lethal injections.
Fewer people were sentenced to death than at any time since the '70s.
"Violent and uncontrollable seizures" could result if Ernest Johnson is administered Missouri's drug protocol.
It's all about the drugs.