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.
Smenkhkare
Filer's conclusions were largely representative of the pre-2010 examinations, noting "...this man was not quite a fully mature adult, between 18 and 21 years when he died." She concluded:
These were largely in keeping with the previous results (18–26 years) allowing for the technologies available. For instance, Derry concluded an age of about 23 and Strouhal gave an age range of 19 to 22. Wente's study found close cranial similarities between the mummies of Tutankhamun, KV55 and Thutmose IV. The seriological tests indicated KV55 and Tutankhamun shared the same rare blood type. Taken together, the KV55 mummy was assumed to be the father or brother of Tutankhamun. Brother seemed more likely since the age would only be old enough to plausibly father a child at the upper extremes.