In the Season 4 finale, the police close in on the Trinity Killer, who cautions Dexter to keep away. But Dexter is willing to do whatever he can to get his man, legal or not. Meanwhile, LaGuerta and Batista must answer for their breach of ethics; and Debra becomes privy to something she’s not sure she wanted to know. Air Date: Dec 13, 2009.

Dexter – Season 4 Episode 12 Finale – The Gateway Aired: Dec. 13, 2009 Click Here to Watch Dexter – Season 4 Episode 12 Finale – The Gateway

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