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.
Amarna Period
Tutankhamun, among the last of his dynasty and the Amarna kings, died before he was twenty years old, and the dynasty's final years clearly were shaky. The royal line of the dynasty died out with Tutankhamun. Two fetuses found buried in his tomb may have been his twin daughters who would have continued the royal lineage, according to a 2008 investigation.