Nothing much is known about Alisha's life before the outbreak except that she was an Army Reservist.
At some point during the time-gap between the third and fourth season, Alisha was found and recruited by Caesar Martinez and/or his other group members.
Whilst at Martinez' camp, Alisha starts a relationship with fellow survivor Tara Chambler and is later seen when the group discuss about the leadership after Martinez' death. She sets off with Philip Blake and the Chambler family when Philip convinces them to leave Martinez' camp for not being safe, but she comes back with them after that. Alisha is with Tara again, smoking a cigarette when a walker gets in the camp and almost kills Tara's niece Meghan.
The Governor is first seen giving a speech to his group, convincing them to attack and take over the Prison for themselves. Alisha seems to agree with the plan. When they arrive at the Prison, she is seen, along with another guard, taking out Hershel Greene and Michonne from a vehicle. Alisha stands on the frontline of The Governor's militia while The Governor talks to Rick Grimes. Once the shooting starts, after Hershel's head is cut off, she finds Tara hiding behind a car, and tells her to run off into the woods. Alisha is then seen again entering the prison grounds, and starts to shoot at Tyreese Williams, who is hiding behind potted plants to take cover. After the man behind her is shot, she turns around to see Lizzie Samuels, aiming a gun at her. After a brief hesitation, Lizzie pulls the trigger protecting Tyreese, blowing a hole through Alisha's forehead and killing her instantly.
Alisha's corpse can be seen lying in the courtyard during the prison attack aftermath.
Alisha's corpse can once again be seen lying in the courtyard as Glenn Rhee rushes out of the prison.
The Governor managed to convince her to go into battle against the prison survivors. As she was shooting at Tyreese, the man that was with her was shot at, and she was in shock to see Lizzie and Mika pointing guns at them. While in shock, Lizzie shot her in the head, saving Tyreese.
This list shows the victims Alisha has killed:
- Numerous counts of inhabitants of the prison (Caused and Direct)
- Numerous counts of Zombies and unnamed people.
While Tara's sister Lilly treats some wounds on Alisha's hands, Tara comments on her rifle, saying it's not good in the field, and that she is more of a "Smith and Wesson gal" herself. Alisha asks if she is always so full of shit, to which Tara replies "yes". Later they are seen sleeping and spending time together, implying they have started a relationship. Later on, after her death, Tara referred to her as her girlfriend.
Upon joining Caesar Martinez's group, Alicia and Lilly have become close as Lilly helps Alicia to treat her wounds.
Alicia was first seen along with Martinez, Mitch and Pete when Philip and Meghan fell into the walker pit. Later on, after The Governor brutally murders Martinez and Pete in order to gain leadership control, he manages to rally the group, including Alicia to assault the prison and to take over it. When Rick Grimes gives a speech to them, Alicia seems to be slightly touched by it. She seems to be shocked when The Governor decapitates Hershel but nevertheless she fires back to the prison inhabitants, killing numbers of them, showing she is loyal to The Governor. She is stunned when she sees Lizzie and Mika drawing weapons at her and gets shot by Lizzie in the head.
- The character's official name (and description) was revealed through an episode preview by Spoiler TV on November 24, 2013.
- Alisha is the second openly homosexual character and second lesbian in The Walking Dead TV series, followed by Tara Chambler.