Deb goes to shop Dexter in but can't go through with it. She spills just enough for Dexter to get taken in for questionning and Dexter denies everything. Meanwhile Deb attempts to kill herself, unable to live with what she's done and the secrets she's still concealing. When Dexter finds out about this he comes clean and confesses to everything he's ever done for the sake of Deb's sanity. Dexter gets arrested and is put on trial for his mass-murders. He is convicted and sent to prison, awaiting death row. It comes out in the trial that Captain Matthews knew all along about Dexter and even helped conceal evidence to protect him.

Final episode sees Deb watch behind the glass screen as Dexter is given the chair.