Not a pleasant sight, huh?

The first trailer for season three of "Boardwalk Empire" has been released, and it doesn't reveal much — it's essentially a stylized shot of Nucky's (SPOILER ALERT) killing of Jimmy at the end of season two, with the words "You can't be half a gangster" flashing on the screen at the end. This could mean that the path Nucky takes, which formerly wasn't all that violent, is about to become much darker. Or it could just be a reminder of the stakes of Nucky's decision to whack one of the show's main characters.

"Boardwalk Empire" returns September 16 at 9 p.m.