Dr. Josef Mengele was a German physician and SS officer during World War II, known for his inhumane medical experiments on prisoners at the Auschwitz concentration camp. He earned the nickname "Angel of Death" due to his cruel practices, which included genetic research and surgeries without anesthesia. After the war, Mengele evaded capture and fled to South America, living in countries like Argentina and Brazil. He remained a fugitive for decades, and his actions during the Holocaust have made him a symbol of the atrocities committed by the Nazi regime. Mengele died in 1979 without facing justice.