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.
Pharaoh
Egyptologist Bob Brier has noted that despite their widespread depiction in royal portraits, no ancient Egyptian crown has ever been discovered. Tutankhamun's tomb, discovered largely intact, did contain such regalia as his crook and flail, but no crown was found among the funerary equipment. Diadems have been discovered.