introduced as in the episode "Fade Out" of the fourth season and was finally incarcerated in the episode "Wrecking Crew" of the seventh season. The Mala Noche (seasons 4–6) is a multibranched gang which Horatio Caine once described as one of the most dangerous in the region and "Miami's new Mafia". First mentioned early in the fourth season, they would become a regular presence on the show for the next two years; many of the murder cases the team uncovered were carried out by one or more of the Mala Noche members. The Mala Noche was also responsible for the murder of Marisol Delko, Eric's sister and Horatio's new wife, on her wedding day. Ultimately, the gang would cease to be a viable threat in the sixth season after Horatio went to Brazil and ultimately killed its remaining leader, who had been extradited from Miami (its original leader, Antonio Riaz, was killed in the fifth-season premiere as revenge for Marisol's death). Walter Resden (Damian Young, season 4): A serial killer and a significant enemy of Caine's. Resden drove Caine out of his former career in the NYPD; he would appear in Miami ten years later, framing Caine for the murder of his (Caine's) girlfriend, Rachael Turner. He gets away with it, however, thanks to the help of Joseph Ratner ("Under Suspicion"), who rules that Resden be released. He reappears several episodes later, targeting the daughter of two of his former victims, and his former foster home siblings. When he attempts to kill Caine with a shotgun, Caine shoots him in the shoulder. Walter Resden is then arrested shortly afterwards, charged not only with attempted murder, but murder as well, due to the discovery of new evidence against him ("Skeletons"). Although Horatio learns that Resden targeted his victims because his foster siblings allowed their foster father to brutally abuse him – his father would beat him with a belt and then lock him in a closet (one of his foster siblings tried to stop his father once and choked his father with the belt) – Caine tells Resden he has no sympathy at all for him. Monica West (Bellamy Young, season 4): A disgraced former Assistant Florida State Attorney. She was the one who planted Natalia Boa Vista as a mole within the MDPD's Crime Lab, hoping she would come up with evidence of corruption within the lab. However, when Natalia