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.
Nefertiti
In a more recent research effort led by Hawass, the mummy was put through CT scan analysis. Researchers concluded that she may be Tutankhamun's biological mother, an unnamed daughter of Amenhotep III and Queen Tiye, not Nefertiti. Fragments of shattered bone were found in the sinus, and blood clots were found. The theory that the damage was inflicted post-mummification was rejected, and a murder scenario was deemed more likely. The broken-off bent forearm found near the mummy, which had been proposed to have belonged to it, was conclusively shown not to actually belong to the Younger Lady. Scholars think that, after Tutankhamun returned Egypt to the traditional religion, he moved his closest relatives – father, grandmother, and biological mother – to the Valley of the Kings to be buried with him (according to the list of figurines and drawings in his tomb).