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.
Zahi Hawass
In February 2010, Hawass and his team announced that they had analyzed the mummies of Tutankhamun and ten other mummies and said that the king could have died from a malaria infection that followed a leg fracture. German researchers Christian Timmann and Christian Meyer have cast doubt on this theory, suggesting other possible alternatives for Tutankhamun's cause of death.