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.
Time Walker
While Plummer conducts his investigation, Douglas translates the hieroglyphic text from the sarcophagus. He hopes it will reveal the identity of the mummy. The text reveals that Tutankhamun found the alien in a coma-like state. Thinking that the unconscious alien was a god, Tutankhamun and his attendants touched it and were killed by its infectious fungus. The king and the alien were then buried together in the king's tomb. Douglas, having figured out that the "mummy" is an alien, makes the connection between the alien and the crystals. He then traces the stolen crystals back to Peter, who admits to the theft and gives Douglas the one crystal he kept for himself.