I think one is a mafia doctor, which was what I've been saying this whole time. The classic strategy is for mafia doctors to claim town doctors, which is why I think Natty is in fact mafia doctor. I have to talk to my source again to get a little more information though.
Two people contacted me directly after night 1. Someone told me in IRC pm that I was being protected by someone. I'm not sure who'd I should be more suspicious of.