Four cases of successful x-ray identification of unknown dead with progressed postmortem changes are reported. Some of the x-ray plates are 25 years old and have been taken during growth process. Skull and spine are especially qualified for identification because the skeleton shows individual, highly specific markers in these regions which do not change during live and after death. The exclusion of identity was possible with regard to a 50 years old patient. She presented a 19 years old urogram as her own to receive a pension after an occupational accident in 1970. Two other cases of x-ray identification (tibia operation and skull) have been already described by us (1988).