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.
Akhenaten
He was all but lost from history until the discovery during the 19th century of the site of Akhetaten, the city he built and designed for the worship of Aten, at Amarna. Early excavations at Amarna by Flinders Petrie sparked interest in the enigmatic pharaoh, and a mummy found in the tomb KV55, which was unearthed in 1907 in a dig led by Edward R. Ayrton, is likely that of Akhenaten. DNA analysis has determined that the man buried in KV55 is the father of King Tutankhamun, but its identification as Akhenaten has been questioned.