Lisa "Atlanta" Jennings (Annalaina Marks) is the main villainess from "Model Behavior," episode 1.19 of Blue Bloods (airdate April 8, 2011). She is a runway model who was working a fashion show with fellow model Sofie Lightner (the daughter of Linda Reagan's sister, Wendy Lightner).
The fashion show saw Sofie and model-turned-TV personality Milli Skye both collapse, with Sofie hospitalized and in a coma (she survived at episode's end), while Milli lost her life. The investigation had Milli originally portrayed as the intended target, though Danny Reagan and Jackie Curatola began to believe that Sofie was the true target and Milli was collateral damage. Suspicion turned to Sofie's rockstar boyfriend, Dorian, when video showed him putting something into Sofie's risotto.
However, Dorian revealed that he was placing truffles inside the dish, which Sofie put down and was taken by Milli, while also revealing that Sofie was actually Dorian's beard and that he had an affinity for hairdresser Harry Bell. Harry became a suspect after it was revealed that the cause of death was mushrooms imported from Morocco, but Danny and Jackie's visit to Harry's apartment resulted in the detectives finding Harry dead in his bathtub, having committed suicide. Dorian was asked about Harry, and he revealed that both of them went to Morocco for Atlanta's photoshoot in Marrakech, and it ended up revealing Atlanta as the true killer.
Danny and Jackie found Atlanta in a wedding dress and on top of a ledge, threatening to jump, while revealing her actions to the pair. After venting that her life was over at age 25, Atlanta revealed that she had wanted to close out the fashion show, but the main spot was given to Sofie instead. To make sure that she would get the spot she wanted, Atlanta turned heel and laced Sofie's risotto with the mushrooms, planning to make her sick, which she did. However, Atlanta's sabotage ended up killing Milli, as Milli took Sofie's dish and ended up succumbing to the poison. As the villainess also revealed, Harry found out about Atlanta's actions, and she threatened to implicate him in her scheme if he didn't keep quiet, which to her obvious distraught guilt and horror led to Harry's suicide. Danny managed to prevent Atlanta from jumping, after which he and Jackie handcuffed and arrested the evil Atlanta for Milli's murder and the attempt on Sofie.