He died by killing himself because at the time he was going to flee to Berchtesgaden but there was word of the Russian army near where Hitler was, so instead of being captured, he decided to shoot himself.
Adolf Hitler was an Austrian-born German politician who was the leader of the Nazi Party, Chancellor of Germany from 1933 to 1945, and Führer ('Leader') of Nazi Germany from 1934 to 1945. He committed self-harm by gunshot on 30 April 1945 in his Führerbunker in Berlin.
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