Berlin (AFP) An attacker stabbed the son of ex-President Richard von Weizsäcker in Berlin and seriously injured another human being. Head physician Fritz von Weizsäcker was attacked on Friday evening during a lecture in the Schlosspark-Klinik in the Charlottenburg district, said a spokesman for the Berlin police of the news agency AFP. Despite immediate resuscitation measures, he died on the spot. A suspect had been arrested.