Why would it be someone who is leaving? Just because the killer is revealed on the 19th does't mean they are going to be caught yet! I don't think it will be anyone obvious ie: Bradley or Peggy!
I think it could be Peggy as she is leaving, but she could do little cameo bits from prison. Ive not heard of Bradley going on to do anything else so I'm not sure about him, but did I see him and stacey get married?
Thats true but doesn't mean he is guilty. There are going to be a lot of red herrings and a twist on the 19th. It will probably be someone who's not yet been in the frame
I think Stacey killed old mitchell. If bradders is leaving maybe he will confess to it to stop her from going to prison. Can't wait to see who did it!!