VIENNA, Austria -- President Thomas Klestil, who brought calm to an office frayed by controversy surrounding his predecessor's past in the Nazi army, died Tuesday, doctors said. He was 71. Earlier Tuesday, medical officials said Klestil was in very critical condition after facing a multiple organ failure. Klestil's heart stopped beating Monday as he was being flown by helicopter to Vienna's General Hospital after being found unconscious. He was admitted in critical condition, and doctors said they could not rule out brain damage as a possible result of lack of oxygen before hospital staff got his heart functioning again.