Okay, after reviewing the different roles in the sign-up thread, it seems obvious that the mafia killed and disposed of Big Pimpin, so we don't get to know what his role was, and that the Vigilante killed NorthSider, since we were given his role. We have now lost both our Cop and our Insane Cop, though we were never told which was which, so it seems wise, at this time, if the Amnesiac would assume one of those roles, so we can at least do some night investigating -- unless you want to roll the dice and see if we lose the Doctor, and take that role over.
To recap, the roles we have remaining are Doctor, Bulletproof x2, Vigilante, Amnesiac, and both mafia roles (Janitor and Hooker) -- except one of those belonged to BP, so we're minus 1 there, and we don't know which. Now that the Janitor has presumably used his power to dispose of BP, he'll just be a regular Mafia -- ThatDude, if I am completely off here, please point it out -- I'm still referring to the Sign-Up Thread
to read about the roles.
I'm going to take a look back at Day 1 and see if any links jump out.