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.
Cổ Loa Citadel
Stories of the Thục Phán's demise vary. Some say he committed suicide by jumping in the ocean. Some say he was borne off to sea by the magic turtle to never be seen again. In some versions, he was told by the magic turtle about his daughter's betrayal and killed his own daughter before killing himself.