>> On WPXI.com: PHOTOS: Pizza delivery driver stabbed during robbery, shoots and kills suspect
The driver was taken to the hospital with a stab wound to the arm. His injuries are serious but officials said he was in stable condition Friday.
Investigators have not released the name of the person who was killed.
The delivery of the pizza was not connected to the robbery, police said.
It was not immediately clear whether the driver would face charges, but police said the shooting appeared to be in self-defense.