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.
KV55
Later re-examinations of the remains confirmed Smith's original identification of the mummy as belonging to a young male (although with feminine trends) but pushed the estimated age of death back to around 20 years. These re-examinations also indicated that the body showed no signs of delayed maturation and that, while the skull was of unusual shape, it certainly wasn't abnormal, and showed no indication of hydrocephalus. Reconstruction of the facial features of the skull also indicated that there was no resemblance with Akhenaten's representation on his monuments. It must be remembered though, that Akhenaten's representations are highly stylised. After the discovery of the tomb of Tutankhamun a close resemblance was noted between his mummy and the body found in KV55 and later tests showed both shared the same blood-group (A2) and serum antigen (MN), all of which suggests Tutankhamun and the individual found in KV55 were closely related to each other, either as father and son, or brothers. Based on these results it was concluded that the KV55 body was too young to be Akhenaten and they were seen to support the claim that the mummy was that of Smenkhkare, an idea first proposed by Rex Engelbach in 1931.