Could very well be a hoax, if you look for it, there's very few scenes with the Sheriff and those are all easily exchangable. Especially the last one where he chokes RJ, you never see both of them at the same time and he's not talking only blinking to answer questions. Very very easy to fake. Furthermore, when did this leak, couple of days ago? They're not sending the episodes to CBS an hour before they're aired so the timing is completely off, the final episode has been edited and finished at least several days ago, speaks for it being a hoax as well.

Plus its a bad episode, simply too bad, the writers arent that dumb