The AP reports,

Simon Wiesenthal, the Holocaust survivor who helped track down numerous Nazi war criminals following World War II then spent the later decades of his life fighting anti-Semitism and prejudice against all people, died Tuesday. He was 96.
Wiesenthal died in his sleep at his home in Vienna, according to Rabbi Marvin Hier, the dean and founder of the Simon Wiesenthal Center in Los Angeles.

Baruch dayan emet.