Who was Franz Ferdinand with when he was assassinated?

He was with his wife Sophie Chotek ... who became the Dutchess of Hohenberg after they married. It is interesting to note that the marriage was opposed by the Archduke's father, but they married anyway.

She and the Archduke were shot by Gavrilo Princip, a Bosnian Serb and part of a movement seeking an independent state. He was 19 years old.