 Accounts differ as to the cause of death; one states that he died by poison only and another that he died by a self-inflicted gunshot while biting down on a cyanide capsule. Contemporary historians have rejected these accounts as being either Soviet propaganda or an attempted compromise in order to reconcile the different conclusions. One eye-witness recorded that the body showed signs of having been shot through the mouth, but this has been proven unlikely. There is also controversy regarding the authenticity of skull and jaw fragments which were recovered. In 2009, American researchers performed DNA tests on a skull Soviet officials had long believed to be Hitler's. The tests and examination revealed that the skull was actually that of a woman less than 40 years old. The jaw fragments which had been recovered were not tested.
