Alexander I (Serbian Cyrillic: , romanized: Aleksandar Obrenovi; 14 August 1876 11 June 1903) reigned as the king of Serbia from 1889 to 1903 when he and his wife, Draga Main, were assassinated by a group of Royal Serbian Army officers, led by Captain Dragutin Dimitrijevi.
The May Coup (Serbian: Мајски преврат, romanized: Majski prevrat) was a coup d'état involving the assassination of the Serbian King Alexander Obrenović and his consort Queen Draga inside the Royal Palace in Belgrade on the night of 10–11 June [O.S. 28–29 May] 1903. This act resulted in the extinction of the Obrenović dynasty which had ruled the Kingdom of Serbia since the middle of the 19th century. A group of Serbian Army officers led by then-Captain Dragutin Dimitrijević (Apis) organized the assassination of the royal couple. After the May Coup, the throne passed to King Peter I of Serbia.
Along with the royal couple, the conspirators killed the Prime Minister Dimitrije Cincar-Marković, the Minister of the Army Milovan Pavlović and General-Adjutant Lazar Petrović. The coup had a significant influence on Serbia's relations with other European powers; the Obrenović dynasty had mostly allied with Austria-Hungary, while the Karađorđević dynasty had close ties both with Russia and with France. Each dynasty received ongoing financial support from their powerful foreign sponsors.

1903May, 29
In the May Coup, Alexander I, King of Serbia, and Queen Draga, are assassinated in Belgrade by the Black Hand (Crna Ruka) organization.
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Events on 1903
- 11Feb
Symphony No. 9 (Bruckner)
Anton Bruckner's 9th Symphony receives its first performance in Vienna, Austria. - 23Feb
Guantanamo Bay Naval Base
Cuba leases Guantánamo Bay to the United States "in perpetuity". - 1Oct
Boston Americans
Baseball: The Boston Americans play the Pittsburgh Pirates in the first game of the modern World Series. - 13Oct
Pittsburgh Pirates
The Boston Red Sox win the first modern World Series, defeating the Pittsburgh Pirates in the eighth game. - 17Dec
Wright Flyer
The Wright brothers make the first controlled powered, heavier-than-air flight in the Wright Flyer at Kitty Hawk, North Carolina.