Dexter

Dexter's former Narcotics Anonymous sponsor.She works as an artist, often using stolen items in her work. Dexter has an affair with her, leading to his breakup with Rita. She confesses to Dexter that she went sober after unintentionally killing her ex-boyfriend while intoxicated. This is later revealed to be a lie; she is in fact a sociopath who hangs out in support groups as an attempt to feel emotions she is otherwise incapable of. She immediately sees through Dexter's "mask" and becomes obsessed with him, believing him to be her soulmate.

She sets her own loft on fire and helps Santos Jimenez attack Dexter, believing that she and Dexter are closest in times of crisis. She also breaks into Rita's house, afraid that Dexter might have gotten back together with her, and Dexter immediately ends their relationship.

In retaliation, she has rough sex with Angel Batista and then accuses him of rape; she had taken Rohypnol immediately after sex so it would look like he had drugged her. Enraged, Debra asks Lundy to run a background check and she discovers Lila's real surname (West) and that she has been illegally living in the United States on an expired visa. Debra then confronts her and demands that she leave the country or be deported. Lila, following Dexter and watching him on his boat with Rita, Astor and Cody, breaks into his van, takes his GPS device and finds the address for Jimenez's cabin. Arriving at the cabin, she finds Doakes caged inside and, upon learning from him that Dexter is the Bay Harbor Butcher, decides to protect Dexter and ignites propane canisters inside the cabin, killing Doakes.

After finding evidence that Lila killed Doakes, Dexter has the justification he needs for killing Lila. Dexter gathers his tools in a bag and goes to Lila's apartment under the guise that they will leave town together. Dexter's plan is foiled when he finds Debra at Lila's and Lila walks in on them. Lila leaves the apartment, taking Dexter's bag with her. Upon examination of the bag, Lila learns of Dexter's plan to kill her.

Later, she abducts Astor and Cody. Although Dexter tracks them down, Lila traps them inside her loft and sets it ablaze. Dexter and the kids narrowly escape, and Lila flees Miami. While living in Paris, Lila checks her mail and discovers a postcard from Miami with Doakes' picture on the back. Dexter, who was in the room the entire time, injects Lila with a spinal epidural (so he can speak his piece to her while also ensuring that her death is painless) and lays her down on the couch. Lila pleads for her life and tells him that she killed Doakes and tried to get rid of the children for Dexter's sake. Dexter thanks her for helping him embrace what he is, and then stabs her through the heart. He wraps her corpse in a plastic garment bag.