Page "The Bunker (book)" Paragraph 25

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.

Walter Bormann also refused to cooperate, in this case because of family connections ( he was Martin Bormann's brother ).

Many people who had been close to Hitler in the final days, most notably Ambassador Walter Hewel, an old friend of Hitler's, committed suicide after the break-out.

Many 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.

Likewise, other important witnesses, such as Johann Rattenhuber, survived Russian captivity, but died so soon after their release that they could never be properly interrogated.