Pike was rushed to hospital following the failed execution attempt. WASHINGTON — The prison chief in the southern US state of Tennessee has resigned, the governor said Saturday, after an unprecedented botched execution left a convicted murderer on a ventilator in critical condition. Key points and original sources are listed below.

• Pike was rushed to hospital following the failed execution attempt.S1

• WASHINGTON — The prison chief in the southern US state of Tennessee has resigned, the governor said Saturday, after an unprecedented botched execution left a convicted murderer on a ventilator in critical condition. Tennessee Department of Correction Commissio...S2