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.
Ankhesenamun
The two fetuses found buried with Tutankhamun have been proven to be his children, and the current theory is Ankhesenamun is their mother. Not enough DNA was able to be retrieved from the mummies in KV21 to make positive identities of the queens. Enough DNA was pulled to show that the mummy known as KV21a fits as the mother of the two fetuses in Tutankhamun's tomb. The assumption that she is Ankhesenamun fit with her being the only known wife of Tutankhamun in the historical record.