A Cyberpunk CRPG where, in addition to lethal and nonlethal weapons, there’s a third category: mnenodestructive. See, due to ubiquitous augmentation and ridiculous medical science, simply shooting someone in the head is insufficient to ensure that they’re permanently dead. If you want to guarantee that someone is dead forever, you need to obliterate their brains thoroughly, either through extreme force or by injecting highly-illegal and expensive nanite agents into their bloodstream.
Thus, the three choices are:
Nonlethal: Doesn’t kill people, just fucks them up. If they witnessed you doing something, they still count as a witness.
Mnenodesctructive: Kills people super good. If they witnessed something, it doesn’t matter.
Lethal: Might kill people, might have them come back more borged up. If they witnessed your actions, they may or may not be able to witness them. If you killed them, they are probably angry about it.
A good idea, but a dificult one, would be to have each NPC have a specific chance of recovering from a lethal kill, which is weighted by how cyborged they are and how healthy they are, but then you’d have to have the story account for alive/dead/borged/borged and pissed off as possible results.