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.
The Younger Lady
It has been suggested that, indeed, the Younger Lady is Nefertiti, as incest was not uncommon. This would mean that Akhenaten did marry his own sister and that he and Nefertiti are the parents of Tutankhamun. Furthermore, Nefertiti, who may have survived her husband, may be identical with Smenkhare and may have adopted this name if she took over the reign after Akhenaten's death (and having her daughter move into her official roles of chief priestess and 'wife'). All this is not proven, but should be mentioned as a further plausible scenario. One difficulty posed by this identification is the mummy's age at death, because Nefertiti gave birth to Meritaten no later than year 1 of Akhenaten's reign and there is evidence that she was still alive during year 16.