Known in the Luftwaffe as the “other Prince”, night fighter pilot Prince Major Egmont zur Lippe-Weissenfeld shot down 51 British warplanes and held the Knights Cross with Oak Leaves, a distinction held by only 246 Luftwaffe officers. He was killed in a flying accident on 12 March 1944. Unlike Wittgenstein, said by his men to have been very cold and extremely strict, Prince Weissenfeld was a natural leader of men and very well liked.
Since both men flew for Nazi Germany, I regret they were not killed earlier.
(Sources: Princes of Darkness: The Lives of Luftwaffe Night Fighter Aces Heinrich Prinz zu Sayn-Wittgenstein and Egmont Prinz zur Lippe-Weissenfeld by Claire Rose Knott and Nightfighters: Luftwaffe and RAF Air Combat Over Europe 1939-1945 by Colin D. Heaton and Anne Marie Lewis)