Yemach shemo vezichro to this disgusting being. He is surely suffering now.
But I don't understand how he is a "half bred" Jew. As I was reading the articles in the site, it seems like he was just some anti-semitic crazed sheygets from gentile parents. Not all Bergs are Jewish, from what I read online it's a common name. How do we know he had some Jewish ancestry?