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from Wikipedia: https://en.wikipedia.org/wiki/Return_to_Sender_(Dexter)

Dexter S1 Ep 6: Return To Sender

 While eating breakfast with Rita, Dexter is called to a crime scene, only to discover that it is the salvage yard where he committed a double murder the previous night. He finds Valerie Castillo's body lying in the Airstream trailer where he killed her and her husband Jorge, despite having thrown the corpses into the ocean. He deduces that the Ice Truck Killer retrieved and planted the body. LaGuerta, Doakes, and Debra discover a young Cuban boy, Oscar, who claims to have seen somebody take Valerie into the trailer. Dexter begins to fear discovery, and has a nightmare of Debra being a serial killer with a modus operandi similar to his own.

As the investigation proceeds, Dexter attempts to discredit each of his colleagues' leads on the case. When Debra asks him to read her report on the killer, profiling a man sharing many of Dexter's characteristics, he second-guesses her theory. Worried about coming under suspicion, he throws his knives into the ocean. However, while looking at the blood drops from his victims, he notices that Valerie's slide has a happy face etched into her sample. Dexter realizes that this is a hint from the Ice Truck Killer, leading him to go to the salvage yard and plant Jorge's fingerprints and a knife bearing a dry drop of Valerie's blood for Doakes' men to find. After successfully framing Jorge for Valerie's murder, Dexter discovers that Oscar's description of the man who "saved" him from Valerie is in fact Jesus Christ.

Meanwhile, Rita learns that her abusive husband Paul has been released from prison, and she forbids him from attending their daughter Astor's birthday party. Doakes takes Debra to dinner with his mother and sisters, while LaGuerta bonds with Oscar and considers adopting him until his uncle arrives to take him home. In flashbacks, a teenaged Debra pleads with her father Harry to bring her on his and Dexter's hunting trips. When Harry forbids her from joining them, she steals his gun and practices shooting cans by herself. Later, Debra lashes out at Dexter in jealousy of the time that he spends time alone with their father.