Then, in 2008, Hawass and his team analyzed Tut's DNA. They found that he suffered from flat feet as well as a bone disease that would u have made it difficult for him to walk. When they analyzed the DNA of the mummies in other tombs nearby, they made some shocking discoveries. They found Tut's father and mother, who had similar DNA, were actually brother and sister. The DNA they passed on to Tut may have left him highly vulnerable to disease. Did an infection that started in his fractured leg-added to the bone disease-cause his death? No one knows for sure. But Hawass and his team hope they will someday have an answer to this age-old mystery