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.
Meketaten
It is possible that chamber formula_3 was the burial place of someone other than Meketaten. There may even have been two burials which may have been those of Neferneferure and Setepenre, but this is not certain. Another theory is that one of the scenes depicts Kiya and that the baby is Tutankhamun. However, Jacobus Van Dijk, in a 2009 book in memory of the late William Murnane has demonstrated that this person was actually a symbolic depiction of the death and rebirth of Meketaten now with the god Aten in the afterlife. John Harris also agrees with Van Dijk's conclusions according to the author.