In June 2010, German Scientists said they believed there was evidence that he had died of sickle cell disease. Other experts, however, rejected the hypothesis of homozygous sickle cell disease based on survival beyond the age of 5 and the location of the osteonecrosis, which is characteristic of Freiberg-Kohler syndrome rather than sickle-cell disease. Research conducted in 2005 by archaeologists, radiologists, and geneticists, who performed CT scans on the mummy, found that he was not killed by a blow to the head, as previously thought. New CT images discovered congenital flaws, which are more Common among the children of Incest. Siblings are more likely to pass on twin copies of deleterious alleles, which is why children of Incest more commonly manifest genetic defects. It is suspected he also had a partially cleft palate, another congenital defect.