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.
Pierre Lacau
Lacau oversaw the discovery of the tomb of Tutankhamun in 1922 by the English archaeologists Howard Carter and Lord Carnarvon in the Valley of the Kings. Relations with Carter were rarely cordial and were exacerbated by both the monopoly of publication rights which Lord Carnarvon sold to "The Times", and pressure from the Egyptian government who resented the lack of Egyptian involvement in the Tutankhamen excavation.