Lucy Letby could face the rest of her life behind bars if she is handed a whole-life order, becoming only the fourth woman in UK history to receive such a sentence.Whole-life orders are the most severe punishment available in the country’s criminal justice system and are reserved for those who commit the most heinous crimes. As the most prolific child serial killer in modern British history, the 33-year-old nurse is expected to be handed such a sentence on Monday. If this happens, she will join a string of the country’s most dangerous offenders who are likely to die behind bars,...