Yeah, Nazeem thugged me and his body now rests on that little ledge just on the right before leaving Whiterun. He'll never hassle me about the Cloud District again though! Louis Letrush is all kinds of bugged though. No one really knows why he's essential after he gets to the Whiterun stables. Maybe he's a potential goal of a radiant quest? Also, without being too specific for spoilers, if you advance one of the main quests in a certain way, there's a very common bug where LL reduplicates himself several times over. So you may end up with three and a half Louis to hate, instead of one. All unkillable.
Edit: wait, you have the multiple Letrushes already don't you? I seem to remember you mentioning it in another post. Is my memory failing?