On February 7, 1979, while visiting his friends Wolfram and Liselotte Bossert in the coastal resort of Bertioga, Sao Paulo , Brazil, Mengele suffered another stroke while swimming and drowned. His body was buried in Embu das Artes under the name "Wolfgang Gerhard", whose identification Mengele had been using since 1971. His son Rolf was the only one in the Mengele family that voluntarily was willing to identify the body.
Nazi doctor Josef Mengele is known as the Angel of Death for his monstrous experiments carried out on Jewish prisoners at Auschwitz-Birkenau in the 1940s. He was obsessed with dwarfism and twins but his choice 'specimen' was a 12-year-old boy's head he planned to dissect. With 732 pairs of twins to experiment on, Mengele once impregnated one twin with the sperm from a different twin to see if she would produce twins. Mengele also injected eyes of people who had different color pupils to see if he could change the eye color.