An AI system here meaning any piece of technology with software that can make autonomous decisions. The software must have made an independent decision to take action to kill a human being, and for this death to have been the only significant outcome of the event (i.e. it was not a byproduct of another outcome, such as saving more people.) The AI system should have a multitude of options available to it as well, not just 'trigger/don't trigger' based on certain parameters.