Tutankhamun: The Truth Uncovered - Dallas Campbell reports on new scientific research being carried out on his fragile remains in an attempt to get to the truth.     What killed King Tutankhamun? Ever since his spectacular tomb was discovered, the boy king has been the most famous pharaoh of all ancient Egypt. But his mysterious death, at just 19 years old, has never been explained. Using CT scan data, the programme creates the first scientifically accurate image of the…