This study is based on an examination of lung tissue from 11 cases of traumatic immediate death with fracture. According to our investigation, pulmonary bone marrow embolic phenomena, such as megakaryocytes associated with fat globules in pulmonary arterioles and a megakaryocyte embolism in a pulmonary capillary, develop in most traumatic immediate death cases with fracture. From the results, we suggest that these pulmonary bone marrow embolic phenomena can be certain evidence of antemortem violence in traumatic immediate death cases.