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Gavrilo Princip - Wikipedia: "Gavrilo and his six co-conspirators were inexperienced with weapons, and it was only due to a freakish set of coincidences that they were successful. The first member of the group attempted a shooting from an upstairs window, but the range on his gun was insufficient. The second member threw a bomb (or a stick of dynamite, according to some reports) at the car, but missed. The explosion destroyed the following car, killing its driver and wounding the passengers. The assassin tried to escape, but was beaten to death by the crowd. The next four never got a chance due to the heavy crowds, and it was beginning to look like the assassination would fail. However, Franz Ferdinand decided to visit the victims of the explosion in the hospital. Princip had gone to a nearby shop for a sandwich, apparantly giving up, when he spotted Ferdinand's car as it drove past. After dashing up to the car, Princip shot Sophie in the head, killing her instantly, and a second shot hit Ferdinand in the chest, but after that his gun locked and he was arrested. The wound sustained by Ferdinand normally would not have been fatal, but because he had his suit sewn shut (he was a very vain man, and couldn't stand the sight of a crease) he bled to death in the time it took to cut the suit open."

Also: Because Princip was too young under Austro-Hungarian law to be given the death penalty, the heir to the throne's assassin was given the maximum sentence of 20 years in prison instead. But his astounding luck didn't extend to wartime prison conditions, so he ended up dying a few years later anyway.