Frank Strada, who oversaw the process that left Christa Pike unconscious and hospitalized, quit as an independent review began.

© Mark Humphrey/Associated Press

Frank Strada, who oversaw the process that left Christa Pike unconscious and hospitalized, quit as an independent review begins.

© Mark Humphrey/Associated Press

The failed execution of Christa Pike has prompted new scrutiny of Frank Strada, who resigned as the state’s top prison official on Saturday, and his past role overseeing executions in Arizona.

© Mark Humphrey/Associated Press