I didn't really pay much attention to the posts, but judging by the beginning of the newspaper, or some kind of shenanigans among the guards (they checked each other, and that's a clue), or one of them died, and the other got all the information and probably information from the second. If so, then Southern probably died.
He didn't leave any obvious clues today, so we need to investigate either yesterday's clue pointing to him, or today's clue pointing to Demo. Going into NNV with three dead townspeople (especially if Kosha is really the Watcher) is unlikely to be a good option.
To sell my soul