A group of Serbian officers storms the royal palace and assassinates King Alexander I of Serbia and his wife, Queen Draga.

The May Coup was a coup d'état in the Kingdom of Serbia which resulted in the assassination of King Alexander I and his consort, Queen Draga, inside the Stari Dvor 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 that had ruled Serbia since the middle of the 19th century. A group of Royal Serbian Army officers led by Captain Dragutin Dimitrijević (Apis) organized the assassination. After the May Coup, the throne passed to King Peter I of the Karađorđević dynasty.

Alexander I was King of Serbia from 1889 until his death in 1903, when he and his wife, Draga Mašin, were assassinated by a group of Royal Serbian Army officers, led by Captain Dragutin Dimitrijević.

Draginja "Draga" Obrenović, née Lunjevica (Луњевица) and formerly Mašin (Машин), was Queen of Serbia as the wife of King Aleksandar Obrenović. She was formerly a lady-in-waiting to Aleksandar's mother, Queen Natalija.

June 11 is the 162nd day of the year in the Gregorian calendar; 203 days remain until the end of the year.