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.
KV63
Given the location of the tomb, and the fact that its entrance was sealed by the same flood layer that sealed that of Tutankhamun, it seems most likely that KV63 was the main embalmers' cache for Tutankhamun's burial. In this case, the long-known group of material deriving from his funeral found in KV54 probably represents an 'overflow' of material requiring disposal after KV63 had been sealed.
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