Screw it. If you kill a NPC they are dead. There are only a small handful of quests that are required so I just need to protect those NPCs. If you go around killing NPCs then it's less quests for you.
@grumpygamer when this happened in Baldur's Gate 1 & 2, they had "Biff the Understudy" enter stage and awkwardly play the part of the murdered NPC