You made all that up out of nothing. They'd only go to jail if it was intentional. The only case where a computer programmer "kills someone" is where he hacks

You made all that up out of nothing. They'd only go to jail if it was intentional. The only case where a computer programmer "kills someone" is where he hacks into a system and interferes with it in a way that foreseeably leads to someone's death. Otherwise, the user voluntarily assumed the risk. Frankly if someone lets a computer drive their car, given their own ample experiences of computers "crashing", it's basically a form of attempted suicide.