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.
The Curse of King Tut's Tomb (2006 film)
In ancient Egypt, Tutankhamun, the boy pharaoh who is said to have died young, was actually sent by the sun god Ra to protect the people from the demon Set, who escaped from the Underworld and caused chaos in Egypt. With Ra's blessing, Tutankhamun manages to overcome Set and keep the demon under control by breaking an emerald tablet into four pieces and sending the pieces to the far corners of the world. However, the tradeoff is that he must remain in the Underworld.