its more of a when then why question but in 1951, the former Crown Prince died of a Heart attack in Hechingen, in the ancestral lands of his family in Swabia, as the family's estates in Brandenburg had been occupied by the Soviet Union.
Wilhelm Tunelli died in 1930.
Wilhelm Leuschner died in 1944.
Wilhelm Lützow died in 1916.
Wilhelm Möllenkamp died in 1917.
Wilhelm Holec died in 1944.
Wilhelm Holtz died in 1913.
Wilhelm Trübner died in 1917.
Wilhelm Tempel died in 1889.
Wilhelm Orthmann died in 1945.
Wilhelm Müller died in 1827.
Wilhelm Schuler died in 2010.
Wilhelm Schuppe died in 1913.