Sex and death come together in the final programme of this series as Piers Morgan interviews Sheila Davalloo, who won’t even begin serving her 50-year sentence for the murder of Anna Lisa Raymundo until she has first served out the 25-year term for the attempted killing of her own husband.

A sex game gone wrong is what took Sheila and her twice-stabbed husband to hospital for treatment, where Sheila stabbed her husband again in the hospital car park. But Sheila was spotted, and this attack prompted the re-opening of the investigation into the killing of the bright and popular Anna Lisa.

What provoked Sheila? Is she still dangerous? In short, why?