Tutankhamun's mummy
Detective Michael R. King and FBI profiler Gregory M. Cooper came together with an actual Egyptologist to form their own theory which was that Tutankhamun was murdered. With the use of forensic evidence and their extensive backgrounds in criminology, they came to the conclusion that he was likely murdered by one of his closest advisors, Ay. Ay did succeed Tutankhamun on the throne, so they used that as the motivation for the murder.
Tutankhamun's mummy
Paul Doherty, a British historian who has written many articles and books on the subject of Ancient Egypt, uses physical evidence collected about the mummy to suggest his theory that Tutankhamun suffered from Marfan syndrome. He believed Tutankhamun must have genetically inherited the disease, and it eventually led to his death.