Officials in Belgrade say the monument will be unveiled on 28 June, 101 years to the day after Princip shot Archduke Franz Ferdinand and his wife Sophie in Sarajevo, the Balkan Insight website reports . "By erecting this monument, Belgrade will appropriately honour a man who by his action became a part of Serbian history and sacrificed himself for freedom," says city manager Goran Vesic . What form the monument will take hasn't yet been revealed, nor has its exact location, but Mr Vesic says it will be 2m (6ft 6in) tall and weigh 350kg (55 stone).