On March 15, 1945 Heim was captured by US soldiers and sent to a camp for prisoners of war. He was released and worked as a gynecologist at Baden-Baden until his disappearance in 1962; he had telephoned his home and was told that the police were waiting for him. Having been questioned on previous occasions, he surmised the reason (an international warrant for his arrest had been in place since that date) and went into hiding. According to his son Rüdiger Heim, he drove through France and Spain onward to Morocco, moving finally to Egypt via Libya.