While most people were cooperative, a few didn't speak to O'Donnell. Johanna Wolf, another Hitler secretary, declined to talk since she was a "private" secretary. Albert Bormann, Martin Bormann's brother, also refused to cooperate because of family connections. Other people who had been close to Hitler in the final days, most notably Ambassador Walther Hewel, committed suicide after the break-out attempt. More witnesses died in Soviet captivity, such as Dr. Werner Haase, the last physician to attend Hitler, who had already been gravely ill with tuberculosis in April 1945.