List of Dexter characters
On a visit to his sister, Dexter and Debra both feel as if they have been drugged; just before he passes out, Dexter sees Hannah standing over him. When he later regains consciousness, Dexter begins investigating Hannah, and finds that she has changed her name and married Miles Foster (Julian Sands), a wealthy businessman. Dexter goes to see Hannah, who says that she had wanted him to kill Foster, but changed her mind after realizing she is still in love with Dexter. Foster warns him to stay away from Hannah, and has him beaten up. Dexter goes to Foster's boat to protect Hannah, but finds that she has already killed him. The two of them dispose of the body, and promise to watch out for each other. The two end up having sex and rekindle their relationship.
Debra Morgan
After consulting with forensics technician Vince Masuka (C. S. Lee), however, Debra deduces that Trinity could not have been the shooter. During a Thanksgiving dinner with Dexter's family, Debra remembers a conversation she had with reporter Christine Hill (Courtney Ford), and realizes Hill has knowledge of the shooting that no one outside the police department knew about, and concludes that she was the shooter. This is proven true in a later episode revealing that Hill is Trinity's daughter. Hill confesses to Debra that she killed Lundy, moments before she commits suicide. Debra then renews her search for Harry's mistress, and finds out about Laura Moser, and the fact that Dexter and the Ice Truck Killer are brothers. She tells Dexter the news (which he already knew), and then tells him that he is "the one consistently good thing" in her life.