Princip realizes that Cabrinovic failed, and decides to take matters into his own hands
While Ferdinand mourns his wife, he is killed by Princip. He is shot while hunched over his wife.
Gavrilo realizes what he's done, and is in awe. He has just killed the Archduke.
After the motorcade incident, they had to go a different route through the city. When this happened the killer, Gavrilo Princip, saw the opportunity to kill the Duke, and did it. He would later be apprehended by the police and die in prison in 1918.
And that is the Assassination of Archduke Franz Ferdinand. The Black Hand Terrorist Group of Serbia was responsible for the death of the Archduke and his wife Sophie, Duchess of Hohenberg.
Princip was arrested after trying to flee the scene. But at this time the damage had already been done.
Princip would be put in prison, where he would die just four years later. He would die from tuberculosis