The credentials of the medical attendant who administered the drugs that killed Oklahoma death row prisoner Clayton Lockett remain a state secret, the Tulsa World reports. Lockett died of a heart attack after his execution was botched two weeks ago. The office of Governor Mary Fallin says that a phlebotomist administered the failed IV that collapsed, which is against protocol. The prison denies this, saying it was an EMT who worked on Lockett. A 2011 law makes it impossible to find the identity of those involved in executions in Oklahoma, even under criminal proceedings. On Tuesday, Texas is set to conduct the nation's first execution since Lockett's bungled one.