Tennessee prison chief to resign after Christa Pike's failed execution

The head of prisons in the US state of Tennessee is resigning after the failed execution of death row inmate Christa Pike on Wednesday.
Governor Bill Lee announced the change on Saturday, sharing the news in a joint statement with Tennessee Department of Correction Commissioner Frank Strada.
Strada said that his stepping down is "in the best interests" of the state, and called the ongoing investigation into the incident "entirely appropriate and necessary".
Opens BBC News in a new tab