Cause of death: apoplexy
Joseph-Napoléon Bonaparte (born Giuseppe di Buonaparte, Italian: [dʒuˈzɛppe di ˌbwɔnaˈparte]; Corsican: Ghjuseppe Napulione Bonaparte; Spanish: José Napoleón Bonaparte; 7 January 1768 – 28 July 1844) was a French statesman, lawyer, diplomat and older brother of Napoleon Bonaparte. During the Napoleonic Wars, the latter made him King of Naples (1806–1808), and then King of Spain (1808–1813). After the fall of Napoleon, Joseph styled himself Comte de Survilliers and emigrated to the United States, where he settled near Bordentown, New Jersey, on an estate overlooking the Delaware River not far from Philadelphia.
Source : Wikipedia