After World War II the Allies refused to recognize Karl Dönitz as the president or führer, Reichspräsident, of Germany. Instead they declared the complete legal extinction of the Third Reich, following the death of Adolf Hitler on April 30, 1945. At the Nuremberg Trials following the war, Dönitz was tried on three criminal counts: (1) conspiracy to commit crimes against peace, war crimes, and crimes against humanity; (2) planning, initiating and waging wars of aggression; and (3) crimes against the laws of war. Dönitz was found not guilty on the first count of the indictment, but guilty on the rest. Many high ranking Allied officers backed him and recommended leniency.
After the trial, Admiral Dönitz was imprisoned for 10 years in Spandau Prison. He was released on October 1, 1956, and retired to the small village of Aumühle. He died there of a heart attack on December 24, 1980. As the last German naval officer to hold the highest rank of Grand Admiral, he was praised and honored by many former German officers and servicemen, as well as British and other foreign naval officers, who came to his funeral in full dress uniform, to pay their final respects.

Captain Hank Bracker, "Suppresed I Rise"