Two men decide to rob an elderly ladys home. They think she is asleep. One man drives the other to the home. The driver waits in the car while the other breaks in the back door. He finds some valuables, but the lady is awake and tries to stop him. In the heat of the moment, he hits her and kills her. Which degree of murder is appropriate for the killer?

Can the driver be charged also? If so, with what degree should the driver be charged?