From Knoxville, Tenn.: A failed execution by lethal injection has left a woman alive and recovering. The woman, 50, had been given two doses of a substance intended to be lethal. Her condition initially required a ventilator, but she is now awake and able to speak.

The circumstances surrounding the failed execution are under review. A medical expert has offered an opinion on what may have gone wrong with the procedure.

Further details about this incident are available from the source, including the woman's background and the events that led to her initial sentence.