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
In his third regnal year, under the influence of his advisors, Tutankhamun reversed several changes made during his father's reign. He ended the worship of the god Aten and restored the god Amun to supremacy. The ban on the cult of Amun was lifted and traditional privileges were restored to its priesthood. The capital was moved back to Thebes and the city of Akhetaten abandoned. This is when he changed his name to Tutankhamun, "Living image of Amun", reinforcing the restoration of Amun.