SoupNazi
Guest
If they fall down a great height, drown, rats eat them, etc. they can die. Also, if you hack pylons or walls of light and they die, that also counts (in fact, a stupid bug occurs in a later mission where you're in a neutral zone, but if you rewire a wall of light and the people who stroll through it die, you immediately are blamed and attacked despite them having no knowledge of you rewiring it). But I don't think there are those in the prison and sewers, so it's more likely someone died drowning or falling or w/e.