Walter Schellenberg
Walter Schellenberg alleged in his memoir that Müller had defected to the Soviets in 1945. Schellenberg also wrote that a German officer—who had been a prisoner of war in Russia—claimed to have seen Müller in Moscow in 1948, and that he had died shortly afterward. There is no reference in the memoir as to who the German officer was or any other details that might help verify this claim.