That said your plan is horribly flawed. If you really wanted to kill someone and get away with it you would use a remote controlled UAV with an explosive charge, and control it anonymously. Lock onto the targets car, and bombs away. UAVs are proven as effective at killing terrorists! Or even an anonymously controlled UAV armed with an automatic pistol! You could control it and get video feedback from it via anonymized cellular communications , lock it onto target, blast, fly off. Unless they can trace the person who controls it, the controller is pretty solid. If they take it down, it has no fingerprints on it right? Launch another. They don't need to be fancy like the military has, just capable of flight for a decent distance and carrying a weapon. You could setup low latency anonymous control channels that would be anon enough (especially with some tactics thrown in) and low latency enough to allow for sufficient control. It sure is awesome being anonymous in a world filled with evil people who paint targets on themselves.