The article says nothing about who was at fault. Aren't pedestrians killed by human-controlled cars every day? Why assume that his death would not have happened had a human been at the wheel? In fact, there was a human in the car ready to take control, and it still happened.
My guess is that investigators will find the pedestrian stepped in front of the vehicle and there was no time for the vehicle to stop.
These vehicles are equipped with sensors that detect obstacles of any kind in their path, and they are programmed to stop on a dime to avoid them with a reaction time of zero. If the car was functioning properly, then the pedestrian had to have stepped in front of the vehicle before it could stop.
The resistance to this technology reminds me of what occurred between horse owners and horseless carriages a hundred years ago. One side has clearly been judged wrong by history, as will be the case here.