Dexter (episode)
Dexter is contacted by his foster sister Debra (Jennifer Carpenter), a vice officer in the Miami Metro Police Department. Dexter, a blood spatter analyst for the department, assists Debra in investigating an apparent serial killer targeting prostitutes. Dexter examines the latest victim and is shocked to find no trace of blood on the dismembered corpse. At the police station, Dexter discusses another murder case being handled by James Doakes (Erik King), a detective who dislikes him. Later, Dexter watches Jamie Jaworski, a murderer who escaped justice due to a faulty warrant, and breaks into his home to find evidence. Once he confirms that Jaworski is guilty, Dexter meets with his girlfriend Rita Bennett (Julie Benz), a former victim of domestic abuse victim; Rita has two young children, Astor and Cody. While on a date with Rita, Dexter finds another murder scene with no traces of blood, this time with the victim's head missing. Dexter theorizes that the killer murders his victims in extreme cold, explaining the absence of blood, and might be using a stolen refrigerated truck. Dexter allows Debra to pitch the theory, but their superior officer, Lt. María LaGuerta (Lauren Vélez), dismisses it.
Debra Morgan
In "Dexter's Final Cut", Deborah disowns Dexter after he cheats on Rita and unintentionally allows pedophile Robert Chase to kill Rita and kidnap Astor. In "Dexter is Dead", Deborah takes custody of Cody, Astor and Dexter's daughter Lily Ann after Dexter is imprisoned for Rita's murder; she knows that Dexter is innocent of that particular crime, but believes that he belongs in prison. After Dexter is freed thanks to his brother Brian's machinations, she refuses to let him see the children and communicates with him only to get him to sign the paperwork to finalize the adoption. However, she is forced to rely on him when Cody, Astor and Nicholas are kidnapped by a Mexican drug lord who is out to get Brian. The three of them team up to infiltrate the drug lord's yacht and rescue the children, and Deborah and Dexter repair their relationship. Deborah saves Dexter's life by killing the drug lord just as he has her wounded brother at his mercy. Moments later, however, Dexter is killed when the yacht explodes; in his final moments, he sees Deborah trying to save him.