- "Acheron: Part II"
While not part of the Reapers' initial attack on Maggie's group, Leah, along with Michael Turner, Paul Wells, and Brandon Carver, remained hidden near the forest.
- "Hunted"
Leah takes part in the fight with Maggie's group which ends with everybody scattered or dead.
- "Rendition"
Leah is seen when Daryl comes across Dog, who is sitting next to a masked Reaper cloaked in black. Daryl orders the Reaper to release his pet, at which point the Reaper takes her mask off and reveals herself to be Leah. She is surprised to see Daryl again, and asks if he is alone. When Daryl confirms he is, Leah says that she saw him on the road with the others. She asks Daryl about them, this time holding him at gunpoint. Daryl claims this was a group he met on the road, but insists he isn't one of them. He attempts to deescalate the situation by leaving, and calls Dog back to him. When Dog doesn't go to him, Leah jokes that she always thought Dog liked Daryl better. Daryl says that, whatever the Reapers' problem is with the group, he's not a part of it. He tries to leave again, but a group of Reapers surround Daryl, and he is taken to Meridian with a bag over his head.
Alone in a cell with him, Daryl lets Leah know he did, in fact, come back and looked everywhere for her, adding that he is sorry she ended up with the Reapers. Leah asserts that the Reapers are her family. They, Leah says, never stopped looking for her and, when they found her, she came home. Leah than asks if the people on the road were Daryl's family, but he claims his people were wiped out in a conflict with another group, and insists he is alone. Considering Daryl's claims, she decides to clean him, but then smothers him with a rag until he is unconscious. When he wakes up, Daryl is waterboarded by two Reapers under Leah's supervision. One of the Reapers, Carver, interrogates Daryl about the others, but Daryl sticks to his story and claims he doesn't know. Eventually, Leah decides to stop the interrogation, despite Carver's protests. Leah implores Daryl to talk, as their leader won't be so nice when he interrogates him. Daryl clarifies that he merely traded with the group by transporting their supplies in exchange for food, and claims he knew the group for less than a week. Leah is unconvinced, and Daryl is taken back to his cell.
Sometime later, Leah visits Daryl and chastises him for being stubborn and lying. Daryl swears he has never lied to her, and that he is not about to start. Leah again asks him about the group, but Daryl maintains he doesn't know anything about them, and insists that he'd help her if he could. He asks to be released along with Dog, and promises that she'll never see him again. Leah asks if that's what he wants, but their conversation is interrupted by a pair of Reapers dragging a badly-beaten Frost to his cell. When Leah inquires what the commotion is about, Carver informs her they found Bossie. When Leah asks about Michael Turner, Carver takes her down the hall, where she witnesses Bossie weeping over his failure to save Turner. Nearby, Turner lies dead, with Mancea preforming a sermon for him. Saddened, Leah preforms a small prayer for Turner. Clearly distraught, Pope proclaims that God is angry and so is he, and orders the Reapers to make the group they're hunting "feel their wrath."
Leah goes back to Daryl's cell and tells him that one of her brothers is dead. She professes, was like the little brother she never had, and this was the first time she lost someone close to her in years since she lost Daryl. Daryl interjects that she didn't lose him, as he did come back for her, but she was gone. Leah protests that Daryl is the one who left in the first place, to which he admits that he was scared of letting go. After sitting in silence for a moment, Leah asserts that it doesn't matter, as their relationship wouldn't have worked out anyway in a world like this. Daryl wonders if this is her opinion or her family's. Leah snaps that Daryl has no right to judge them based on the things he has done himself, and claims that this is, and always was, who she really is.
Daryl, however, doesn't believe her. Leah says that she can help Daryl save himself, and maintains she still cares about him despite everything. This is why, she warns, he needs to tell her something, or she won't be able to control what Pope will do, as her commander is angry about Turner and wants someone to pay. Finally, Daryl admits that the group was led by a "woman," with her lieutenants being "a tall, skinny guy who never shuts up" and a "priest who carries a shotgun." He also warns Leah that the group outnumbers the Reapers, with at least three dozen fighters. Grateful for the information, Leah promises to get Daryl out of his cell. Before she leaves, Daryl asks when he gets to meet Pope, to which Leah assures him it will be soon.
Leah goes to see Pope and conveys what Daryl told her. Furthermore, she suggests they recruit Daryl. She is frustrated when Pope ignores her, and demands a response. Pope calmly replies that not everything is about her, and blames her for losing a day of tracking so Leah could interrogate her "old boyfriend." After a moment of silence, Pope asks Leah about Daryl, to which she says that Daryl would be a good fit for their group due to being fearless. Pope, however, is skeptical, and thinks Daryl just wants to be with Leah. He then wonders why Leah didn't kill Daryl when she had the chance. Leah confesses that Daryl meant something to her at one point, but claims she severed all ties when she rejoined the Reapers, and doesn't regret her decision. Pope confides that he trusts Leah more than any of the other Reapers, and asks if she thinks they can trust Daryl. When she says yes, Pope is pleased, intends on finding out for himself.
in the interrogation room, Leah unties Daryl and says that Pope is on his way, and instructs Daryl to follow her lead. Hearing a thump on the other side of the door, Leah goes to open it, but finds it locked. She then notices liquid leaking from underneath the door, and jumps away just as it is set on fire. With the cabin in flames, Leah and Daryl scramble to find a way out. Leah is soon incapacitated by the smoke, leaving Daryl to find something to pry the windows open. Leah finds the waterboarding table, which Daryl then breaks and uses one of the legs to pry the bars off the windows. He helps Leah climb out, before evacuating himself. Outside, they find that Pope and the other Reapers watching them. Daryl is deemed "forged by fire, ordained by God" by Pope, who welcomes him into their ranks.
Leah is seen at a bonfire, where the Reapers are eating dinner. Pope then praises Bossie for carrying his fallen comrade for ten miles on his back, to which Bossie exclaims that he just did what any of them would have done. After inquiring about Bossie's wounds, Pope notes that the wounds are on his back. Despite Leah trying to calm him, Pope once again asks where Bossie was when Turner was being attacked and accuses him of abandoning Turner despite his story stating that he refused to leave his brother behind. Pope then adds that God doesn't just use fire as his baptism, but also his wrath. As a result, Pope chooses to execute him in front of the other Reapers, much to the horror of Leah and the other Reapers.
- "On the Inside"
Leah is sent by Pope to scout the location, Arbor Hills, after gaining that information from Frost, with a crew of Reapers to capture Maggie's group. Leah, Daryl, Carver and a crew of Reapers approach the supply depot. The Reapers burst into the supply depot and search the house. No one is there. Leah orders them to search the entire town.
The Reapers search another house. Leah finds some wet, bloody bandages, indicating someone was recently there. Daryl notices a trap door under a rug and quietly slides the rug over the door. He offers to track Maggie's group outside. Carver suspects something and quarrels with Daryl. Leah tells them to stop arguing and sends Carver upstairs to sweep the rooms one more time, but warns Daryl not to anger Carver.
Daryl criticizes the Reapers' plan of attack and slyly incorporates intel about the Reapers as he talks, knowing that Maggie's group is listening. Carver accuses Daryl of being disloyal. Daryl admits that the only reason he joined the Reapers is because he cares about Leah, but says he will follow Pope out of fear. Carver notices the trap door and opens it. The basement is empty.
The Reapers return to Meridian. Carver tells Pope that Maggie's group got away. Pope reveals that he continued to interrogate Frost after they left and got all the information he needed. They see Frost tied to a post: he is now a walker. Pope brings Carver inside Meridian and laughs with him about something. Leah looks at Daryl, leaving both wondering what it means.
- "Promises Broken"
Leah witness Pope screaming at Washington and Ancheta for failing to find Maggie and her people. Leah admonishes Pope for yelling at his soldiers and takes the blame for them. Pope tells Leah to do another sweep with Daryl. Leah and Daryl search the outskirts of Meridian. Daryl commends Leah for standing up for her crew. Leah defends Pope's behavior and says he is like a father to her.
Daryl begins asking Leah about the Reapers' history and why they're after Maggie's group; Leah says they took Meridian, justifying it since they needed a place to stay, and that they are only hunting Maggie so she doesn't try to take revenge. Leah confides in Daryl that she sees Pope as a father figure and that his recent behavior is unusual, but Daryl is privately unconvinced.
The two come across a lone survivor, who promises that he's alone and is looking for supplies for his sick wife. Leah asks Pope what to do with him over the radio, and Pope orders them to kill him and his family. The survivor leads Leah and Daryl to his hideout, where his sick wife and son are. Leah tells the man to leave with his son and never return, and he obliges as Daryl kills his wife out of mercy. Leah tells Daryl she will tell Pope he killed the family to improve his standing. Daryl tries to tell Leah something, but they are ordered to immediately return to Meridian.
- "For Blood"
Leah, Daryl and Pope watch the horde from the top of Meridian's perimeter wall. Leah observes the horde is moving in a peculiar pattern. Daryl offers to lead the horde away from Meridian. Pope adopts Daryl's strategy, but sends Wells instead. When the Reapers stop hearing back from Wells over the radio, Leah insists on helping Wells, but Pope says he's already dead. Leah realizes Pope dispatched Wells as bait to confirm his hunch that Maggie is controlling the horde. Leah reminds Pope that Wells was part of their family, but Pope says it was Wells' fate to die.
The horde continues to trip the mines outside Meridian. Leah laments all the people they've lost, but Pope reasons that every war has its sacrifices. Daryl joins Leah and Ancheta on a rooftop overlooking the community. Daryl quietly asks Leah if she still believes in Pope. Leah admits that it's hard to watch Pope hurt the people that she cares about. He invites her to abandon the Reapers and run away together. When she refuses, Daryl confesses to Leah that he is with Maggie's group, and that they were hiding among the dead to lead the horde to Meridian. He begs Leah not to kill them and asks for her help to stop Pope. Despite feeling hurt and betrayed, Leah keeps his secret from Pope when he arrives on the rooftop.
Pope orders Ancheta to launch the hwacha. Leah says the hwacha will end up killing their own people, but Pope reasons that it's their time to die. Ancheta lights the fuse. Daryl unsheathes his knives to attack Pope. Leah stabs Pope in the neck. Daryl hurls a knife into Ancheta and puts out the fuse. Pope crawls on the ground. Leah stabs him once more, killing him. Daryl reaches out his hand to escape with Leah, but she instead radios everyone that Daryl killed Pope and is with the enemy. When he questions her why she did that, she tells Daryl that she would do anything to protect her family, like he did. Daryl escapes moments before Carver and Boone arrive. Leah instructs them to close the gate and kill everything inside the walls.
Leah radios the Reapers with orders to pull back. After the courtyard is cleared of Reapers, she launches rockets at Maggie's group below.
- "No Other Way"
Leah fires the hwacha at walkers as they flood into the compound, but Maggie's group manage to escape alive. She radios Carver and orders him to kill everyone he finds. Leah walks through the Meridian school with Washington, and the pair come across Austin's body, having been killed by Daryl. She mourns him and declares she won't lose anyone else.
Daryl contacts Leah and arranges the trade. Maggie's group meets with Leah and the remaining Reapers. Daryl offers to release Carver if the Reapers leave Meridian, but vows to kill them if they return. Leah rejects his offer and reveals that Jenson will gun them down if they don’t release Carver. Daryl reluctantly lets Carver go. Gabriel shoots Carver in the leg and informs Leah via walkie that he killed Jenson, forcing Leah to accept Daryl's deal.
However, Maggie refuses to release Brandon and Leah says goodbye to him, promising to see him later. As Leah starts to leave with Boone and Washington, a vengeful Maggie kills the both of them in cold blood as Leah manages to flee, only being grazed in the shoulder by a bullet. Daryl tracks down Leah and states that things could've been different and tells her to go before he changes his mind about letting her live.
- "The Rotten Core"
In a flashback set two weeks before the events at Riverbend, Leah ambushes the Commonwealth's weapons' convoy, killing three soldiers and slitting the throat of the fourth as she begs for her life.
- "Trust"
At night, Leah sits in her camp, cleaning one of her stolen AR-15s. Leaning it up against another stolen weapon, Leah enters her tent before several Commonwealth soldiers enter the camp moments later and find the tent empty. Leah shoots and wounds two of the soldiers before Lance Hornsby steps forward, asking Leah to hold her fire and stating that they are there to talk. Lance notes that they have come a long way to find her and that Leah is not easy to track down. Lance asks that, since Leah has caused him "more than a handful of trouble", the least she can do is hear what he has to say before she kills them. Leah steps out into the open, pointing a gun at Lance and she orders him to talk fast. Lance introduces himself and he tells a visibly intrigued Leah that he's there to offer her a job.
- "Acts of God"
Leah prepares her gear to go after Maggie, ignoring Lance's attempts at conversation. Lance tells Leah that she gets the scalp of the woman who killed Leah's family and he finally gets to do his job without interference. Leah chuckles as a swarm of locusts fly overhead and Lance tells her that he'll need to see Maggie when she's dead, handing Leah a radio. Finally acknowledging Lance, Leah promises that he will and departs with the Commonwealth soldiers that Lance has assigned to assist her.
At night, Leah's team sneaks into the Hilltop through the attic window using a grappling hook. However, three of Leah's men trigger an explosive booby trap left behind by Maggie, Lydia, Elijah and Marco, killing them. As Maggie's group prepares to go in and recover the soldiers' weapons, Leah emerges from the burning Barrington House and shoots Marco in the back of the head, killing him. Recognizing Leah from the fight in Meridian, Maggie quickly leads Lydia and Elijah in running away as Leah advances towards them.
As Leah chases them, a furious Lance contacts her over the radio, demanding to know what the hell that was. An unrepentant Leah simply tells him that she drew them out and that she's doing this her way. Lance angrily states that Leah's way got his men killed, but Leah calls it collateral damage and discards her radio. Leah hunts Maggie through the nearby woods, leading to a game of cat-and-mouse between the two women. Maggie manages to shoot Leah in the leg and follows the blood trail, trying to sneak up on Leah as she treats her wound behind a tree. However, Leah manages to sneak around the tree and ambush Maggie, knocking Maggie out with the butt of her rifle.
The next morning, Maggie wakes up, tied to a chair in Leah's old cabin. Leah aims a gun at Maggie, telling Maggie that she's waited for this moment for a long time. Maggie knows that Leah wants revenge, having wanted it herself for a long time. However, Maggie knows that Leah can't just kill her as that would be too easy and Leah would've done it already if that was what she wanted. Leah lowers her gun as Maggie goes on to say that Leah wants her to suffer and to feel everything that she felt, all of the pain. Despite this, Maggie knows that while Leah thinks that somewhere inside of her Leah thinks that it will take away her pain, it won't. Leah states that "you're wrong. It's not just you. By the time I'm done... everyone you love will be dead." Maggie guesses that that will make them even: Maggie took Leah's family and Leah will take Maggie's in return. Leah claims that nature has a way of taking care of these things, but Maggie tells her that it's not nature or fate, it's them and Maggie killed the Reapers because that's what she wanted. Maggie tells Leah that if this is what she wants to do it.
As Leah points her gun at Maggie's head, Maggie finally manages to free her hands and knocks Leah's gun away from her. The two women engage in a brutal fight with Maggie grabbing one of Leah's knives to attack her with. Leah ultimately overpowers Maggie and, straddling her, tries to stab Maggie in the chest as Maggie desperately tries to stop her. Suddenly, Daryl, having tracked Leah and Maggie back to the cabin, shoots Leah in the head, killing her and saving Maggie's life. As Maggie pushes Leah's body off of her, Daryl stares sadly for a moment at his former lover before noticing Lance and more Commonwealth soldiers outside. After Daryl attempts to kill Lance and fails, he and Maggie flee from Leah's cabin through a back window.
When Lance enters the cabin, he is shocked and angry to find Leah's corpse lying on the floor and Daryl and Maggie gone.