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
A study showed that of the 58 people who were present when the tomb and sarcophagus were opened, only eight died within a dozen years. All the others were still alive, including Howard Carter, who died of lymphoma in 1939 at the age of 64. The last survivors included Lady Evelyn Herbert, Lord Carnarvon's daughter who was among the first people to enter the tomb after its discovery in November 1922, who lived for a further 57 years and died in 1980, and American archaeologist J.O. Kinnaman who died in 1961, 39 years after the event.