This discussion may contain spoilers!
I had a theory after episode 1 that Colin is somehow involved and believe I have found additional evidence to support that. Now, we all think that crane is definitely not the killer and it is most likely a group effort against Bigby, probably for revenge. Now, in episode 2, when you investigate room 207 you have the option to examine a cigarette. This cigarette would have to be from the killer as only Crane used the room(Long term rental) and he does not smoke. When you examine the cigarette, Beauty asks why it would be there, as you are the only one that smokes them. However, in episode one it is apparent that colin smokes this huff and puff brand cigarette too, as he asks you for one in the apartment. Now I'm not saying that Colin outright killed her, but maybe he was in the room with the killer and possibly other conspirators. Just my two cents.