Since all of you wanted it, here I am.
As much as it appears not to be, I will claim to be the cop.
I haven't gotten much out of my investigations, and this late in the game my investigations would be rather helpful though they don't have much power roles found in them. I also know that this makes me rather untrustworthy that I actually trusted dessern and omo, but I wasn't really there to see other reasons to why they were suspicious either. My investigations won't do much this late in the game either, as the serial killer and the godfather turn up as citizens, which means any of the citizens can be the serial killer, but we'll have to find this our later.
Superstein (my past self) investigated:
Sploorky[Deceased] as Civilian.
grimmjowforever[Replacing DillonSaysRawr] as The Mayor. (I didn't know at this time if the copycat appears to have the role of the person they copied, but when grimmjow claimed to be the jkang's copycat and then claimed to be the mayor, it fit for me.)
I have investigated:
Ltin as Civilian. (can't remember if he's dead or not, I believe not.)
Old_Man_Oak_63 as Civilian.
From what I said above, again, not all of these people may be civilians, as the serial killer appears as a civilian, making it sorta useless.
I'll also be at the phantom of the opera today, so I might not post :D.