For better final season, I would have changed the entire plot line of season, but with existing plot line I would have ended the last 3-4 episodes with Daniel Vogel and Dexter playing the game of cat and mouse. Vogel would be threatening to reveal Dexter's secret and asking Dexter to do his bidding, asking him to kill 2-3 people with his modes operands (cutting brains etc) thereby clearing himself of suspicion. Dexter would hatch a plan to trap Daniel by calling him to meet at a secluded place. Fight ensues between Daniel and Dexter ending in Dexter being fatally wounded. Debra reaches in nick of time to shoot Daniel. Daniel would die immediately. Dexter dies in his pool of blood with his head in Debra's lap and Debra grieving profusely. Born in Blood, Died in Blood.