Who was 'Angel of Death' Josef, the doctor of Auschwitz?

Josef Rudolf Mengele, so-called 'Angel of Death', was a doctor who performed deadly experiments on prisoners at Auschwitz concentration camp during World War II. The Nazi selected prisoners for experiments and sent others to die in gas chambers. He allegedly removed people's organs without anaesthesia and intentionally infected his subjects with diseases. He was declared dead on June 21, 1985.