As for the current status of Joseph Mengele, he fled Europe after the war and lived in various countries under assumed names before dying in Brazil in 1979. Given his lack of access to financial resources after the war and his subsequent life in hiding, it is improbable that Mengele left behind a significant estate or net worth. Therefore, estimating his net worth in USD would likely be negligible, obscured by the shadows of his crimes and the lack of any enduring financial legacy.