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.
KV54
When Tutankhamun's tomb was discovered in 1922, similar items were found in the entrance corridor, and it is thought that after the first robbery attempt of the tomb, the embalming cache material was moved to the pit that was KV54, and the corridor filled with rocky debris in order to stop any future robbery attempts.