He was an Assistant District Attorney (ADA) in Miami.
He was the Third Main Antagonist, along with a man named George King, who was referred to as The Skinner. For Dexter, Miguel became a personal antagonist, although initially they were close and Dexter thought he could finally have a friend. Ultimately, Dexter was betrayed by Miguel's selfish ambition to find the right "method" to deal out his own personal justice.
Miguel was of Cuban descent, the tallest of his three brothers. He was an attractive man, having fine black hair matched with a mustache and tanned skin. He spoke with a slight accent.
His typical attire consisted of dress pants and an expensive button up shirt with a tie. Underneath this he wore a sleeveless white t-shirt. On occasion, he also wore a suit jacket. He usually wore expensive dress shoes.
His kill attire was a pitch-black outfit, complete with black leather gloves and boots. Miguel's shirt covered much of his neck.
Miguel Prado conveyed the cold harshness of a power hungry campaigner for personal justice.
Miguel was the Assistant District Attorney (ADA) for the City of Miami. An accomplished lawyer, he felt that many cases slipped from his grasp and "cold-blooded killers" were set free, thanks to opposing attorneys such as Ellen Wolf. He was a complex character with varying emotions and upon meeting Dexter Morgan, he worked his way into "breaking through" the "walls" Dexter sets up around himself. Essentially, he becomes Dexter's "best friend" and was perhaps one of the only people to embrace Dexter for what he truly is, together with Dexter's deceased brother Brian Moser and later, Lumen Pierce (however her "Dark Passenger" disappears, thus she felt it best to leave).
Miguel was notorious for his harsh enforcement of the law, making him powerful, influential, and popular with the regular police and citizens of Miami. One of his most popular referenced cases is his sentencing of Chicky Hines, a man considered innocent, despite the evidence mounted in his favor and witness testimonies. Rather than allow this "victory" to pass, Miguel held onto it... unwilling to admit that he was wrong and this led to multiple conflicts between Lieutenant Maria LaGuerta (whom he had a former romantic history with) and Ellen Wolf, the attorney chosen to represent Chicky (who believes in his innocence).
However, sitting idly by was not a strong-suit for him and he pushed further, until he convinced Dexter to start pursuing other killers such as Ethan Turner and Clemson Galt before finally being allowed to take a life of his own, in Billy Fleeter. This creates an uncontrollable monster in Miguel that Dexter did not anticipate, who kills the "mostly innocent" Ellen Wolf and later attempts to target Maria LaGuerta, before Dexter intervenes and permanently "ends" their friendship. Because of this event, Dexter is very wary about "partners", having only accepted a second apprentice two years later in Lumen Pierce and later a third apprentice five years later in Zach Hamilton.
Miguel comes from a well-connected family whom he cares for deeply. He has two brothers, Ramon and Oscar, and a wife, Sylvia. He revealed that his father is a Vietnam veteran when Dexter appeared with the knife he used to kill a drug-dealer named "Freebo" and, by accident, Miguel's younger brother, Oscar. He also revealed that his father was abusive and said that he felt great when he "kicked the shit out of him and threw him down the stairs." Prado takes it hard when his younger brother, Oscar, is found dead in the house of Freebo. After that, Miguel calls Dexter, meets him at the crime scene, and questions him about the murder scene. After Dexter describes what he believes happened to Oscar, Miguel confronts him about investigating Oscar. Dexter tells him that he was interested in the case due to Miguel's relationship to the victim. This leads Miguel to apologize and invite Dexter to his brother's funeral.
Miguel kept inquiring about his brothers case and, with help of Ramon, managed to get Freebo's mother's cellphone. While Miguel was talking to Ramon, LaGuerta came to him and informed him that Batista and Quinn had obtained a witness that could prove Chicky Hines' innocence. Miguel told Laguerta that he appreciates that she had informed him. He invited Dexter and Rita to his house.
Afterward Miguel tracked Freebo using his mother's cellphone to his girlfriend's house and had intentions to kill him. But Dexter had beat him to it and killed Freebo first. Miguel caught Dexter leaving the garage, where Freebo's body was with a murder weapon in his hand (his father's combat knife he kept from Vietnam), but Dexter convinced him that he had killed Freebo in self-defense and kept Miguel from entering in kill room. Before Miguel left, some of Freebo's blood spilled onto his shirt. This event bonded Miguel with Dexter and they started hanging out together, making Dexter believe that Miguel could actually become his friend. Despite what Maria had told him, Miguel ignored the witness and helped sentence Chicky Hines, telling her that the evidence was a bluff. After Freebo's death, he became worried that police were wasting their time looking for him, especially when Freebo became suspect in Javier Garza's murder case, although he was actually dead. Dexter managed to put investigation on the right track and Miguel gave him his bloody shirt with Freebo's blood, telling Dexter that he trusts him.
Miguel insists that Ramon should also know that Freebo is dead, but Dexter is unsure and decides to show Miguel that he can't trust Ramon by pretending to tip off Freebo's whereabouts and setting up a meeting at a bar. At the bar, Miguel and Dexter show up, and while Miguel and Ramon are talking, Dexter sics a security guard on Ramon, who hits him. Miguel then believes that Ramon should be kept out from Freebo's situation. When he is playing golf with Dexter, he tells him about a man named Ethan Turner, who has killed at least two of his wives and gotten away with it. After Dexter goes after Ethan, Miguel and Sylvia escort Rita to hospital as she has complications. Miguel also calls Debra and the Coast Guard to find Dexter, but soon realizes what Dexter had done. Although Dexter denied it, Miguel convinces him that he is happy that he took care of Ethan.
Miguel wanted to get more involved, leading Dexter to offer him to break out a Nazi named Clemson Galt from prison, because he had authorized some murders hoping that Miguel would back down. Instead, Miguel agreed to help Dexter and ordered Galt to be brought for questioning as a possible witness in one of his cases. Miguel then gave Galt a key and allowed him to escape, claiming that his Nazi pals had set the escape up. But in reality it was Dexter who was waiting for Galt, managing to escape with Miguel's help when security locked all entrances. Miguel wanted to be with Dexter when he would kill Galt, but was instead led to an empty house, because Dexter wanted his kill to be private. Although Miguel's and Dexter's friendship wasn't affected by this, Miguel's rival Ellen Wolf soon endangered it.
A man named Albert Chung had killed a college student, and Miguel claimed Ellen was responsible for his escape when he killed an old lady by pushing her down the stairs. Miguel urges Dexter to kill her because she lets criminals go. Though Dexter said that she only did her job, Miguel told Dexter to "keep an open mind" about her. Later, Miguel was present at the police station with LaGuerta, Dexter and Wolf, arguing about Chung's surrender terms. There, Miguel got into a serious fight with Ellen. Later at Miguel's house, Dexter told Miguel that he wouldn't kill Ellen, prompting Dexter and Rita to leave early. When Dexter and Miguel later meet at the bar, Miguel revealed that Chung was captured with Wolf's help and admitted to Dexter that he was wrong about killing her. Dexter then asked Miguel if he would become his best man.
They later meet and Miguel tells Dexter that he once pushed his father down the stairs and that he, like Dexter, has darkness inside and he wants to release it. Dexter is convinced by Miguel and together they capture Billy Fleeter and take him to the designated kill room. With Dexter's guidance Miguel stabs Billy, but wants to take his ring with him as souvenir, but Dexter stops him from doing that and tells him to go home and that he will take care of the body. Miguel thanks Dexter but instead of going home he visits Ellen Wolf at her home. In the morning, Sylvia comes to Rita's house and tells Rita and Dexter that Miguel hasn't been home all night and that he is probably cheating her. When Dexter meets Miguel he lies to Dexter, who soon finds out that Miguel killed Wolf and buried her body in cemetery. Meanwhile Miguel is still excited about last night and goes to see his wife and brings her flowers, but instead of Sylvia he meets Rita at his home. Miguel gives flowers to Rita instead, but she says that he should give them to Sylvia instead. Rita also confronts Miguel about his indiscretions. Miguel admits that Rita is right. Dexter then confronts Miguel about Ellen Wolf, who admits that he was wrong about killing her and that he is sorry for betraying Dexter's trust. However this turns out to be a bluff, because after Wolf's body is found at the cemetery (Dexter had dug her body up to teach Miguel a lesson) he gives Dexter the same speech he gave Rita.
Miguel comes to the police station, where he gets involved in the Skinner Case as Debra, Quinn and Batista ask for his help to get Anton's location out of George Washington King who is believed to be (and actually is) the Skinner and is about to be released. Miguel first declines, but upon hearing that the surveillance in the interrogation room would be shut down, he goes to talk to George and convince him to cut a deal. However Miguel comes out shortly to tell everyone that he was unsuccessful. After that Miguel visits LaGuerta and comforts her. Meanwhile Dexter who is beginning to distrust Miguel runs a blood test on the shirt that Miguel gave only to find out that the shirt is covered with cow's blood and that Miguel had been lying to him the entire time.
Miguel and Sylvia had arranged catering for Dexter's and Rita's wedding as a wedding gift. Dexter started to consider putting Miguel under his control in order to make sure that he would never kill another innocent human again. This resulted in a struggle between both Miguel and Dexter to see who has upper hand. Miguel managed to get evidence that Debra was having romantic relationship with Anton, who was her witness in Skinner case and threatened to use this information if Dexter doesn't give in. However, Dexter managed to turn the tide, because he found Wolf's wedding ring which Miguel had taken from the crime scene as a trophy and hidden in his box of cigars. Eventually Miguel and Dexter met on the roof of the police station where Miguel told Dexter that there is nothing he can do to stop him. After their conversation, Miguel contacted George Washington King who had been watching them the entire time and told him that Dexter knew how to find Freebo.
Eventually, LaGuerta began to suspect Miguel of the Ellen Wolf murder and he decided to kill her in order to cover his tracks. Dexter managed to ambush Miguel at LaGuerta's house and killed him, making it look like the King's handiwork. Before he killed Miguel, Dexter told him the truth about Oscar's death and Miguel hinted that George King would eventually kill Dexter, due to setting Dexter up.
Knowing that Miguel is a threat to him and Debra, Dexter decides to kill him. When Miguel is about to exit Maria LaGuerta's house to find and kill her, Miguel quickly finds himself injected with a tranquilizer by Dexter Morgan (who has already learned of Miguel's nefarious plans). Miguel awakens strapped to a table in the middle of a plastic-covered room with pictures of Ellen Wolf and Miguel's attempted victim, Maria LaGuerta, situated on the side of a wall. After noticing the knives, Miguel proclaims that it doesn't have to come to this, to which Dexter responds that it always does. Miguel pleads to be released, under the false impression much different from Dexter's other victims, though Dexter knows that Miguel is untrustworthy after the betrayal that he faced. Miguel tells Dexter that he views him as a brother, to which Dexter responds that he killed his own brother as well as Miguel's. This revelation enrages Miguel, but he begs for forgiveness once more. Dexter refuses to accept his apology, and they converse one last time before Dexter wraps a wire around his neck and strangles him to death. Dexter frames The Skinner for the murder and leaves Miguel's body out in the middle of a public space. Despite his actions, Miguel was still remembered as a hero, with many memorial honors (namely a highway named after him) bestowed upon him in his memory.
- According to his conversations with Dexter, he sentenced a few people to death..
- Ethan Turner - Suggested to Dexter to test him.
- Clemson Galt - Helped Dexter capture and transport him.
- Billy Fleeter (age 40) - He stabbed him in the chest under Dexter's supervision.
- Ellen Wolf (age 38) - He beat, strangled, and stabbed her in the chest.
- His Unnamed Father - Miguel told Dexter that he beat up his father and threw him down the stairs in his early life and that he enjoyed it. Later, however, Ramon Prado told Dexter that it was he who did it.
- Fred Bowman - Miguel found his hideout ready to shoot him, only to find that Dexter had already killed him.
- Maria LaGuerta - Miguel broke into her house intending to kill her, but she was not at home.
- Dexter Morgan - H led George King to believe that Dexter knew of Freebo's whereabouts in hopes that King would kill him.
- Miguel derived pleasure in killing, disemboweling, and cooking the fish he caught while with Dexter.
- Unknown Person - Miguel had a candidate for their next shared kill on the day after he killed Billy Fleeter and Ellen Wolf, but the idea was abandoned by both of them.
- George King - Miguel suggested him to Dexter as their next "shared project."
- Miguel, as most other serial killers (including Dexter himself) had a certain fascination in keeping trophies. In Miguel's case, his trophy of choice were rings worn by his victims. He intended to take a varsity ring from Billy Fleeter, and took one of Ellen Wolf's two wedding rings, storing it in his humidor.
- It's interesting how Miguel's modus operandi progressed to from being legislative and to being more violent. He originally intended to shoot Freebo, as well as Billy Fleeter, but he used a knife on Fleeter and Ellen Wolf.
- After Season Three, Miguel is not mentioned until Season Five, where Dexter simply mentions his name when referring to whether or not Lumen Pierce could accept who he was. Also, in Season Eight, his wife makes a return, helping Dexter sell his condo. She briefly mentions Miguel.
- Miguel is the first main antagonist to not be killed in the final episode of a season.