A successful civil rights attorney, Andrea was on a road trip with her younger sister Amy, headed back to Amy's college when the zombie apocalypse occurred. They were rescued by Dale, and they've been living with him ever since.

Never one to shy away from a fight, Andrea is headstrong, opinionated and first and foremost interested in keeping Amy safe. When Rick's actions strand Andrea and others in a departments store in Atlanta, Andrea is the first to confront Rick, sticking a gun in his face and declaring, "You dumb son of a bitch — we ought to kill you!"

Andrea has not always had the closest relationship with Amy. Nevertheless, she is determined to stand strong as Amy's only remaining family, and give her sister some sense of normalcy. While in Atlanta, Andrea steals a necklace with a mermaid pendant — Amy's favorite — and plans to give it to her as a birthday present.

Amy and Andrea don't know what has become of their parents, but Andrea has no real expectation of them being alive. The sisters reflect on this one day while fishing in a lake near their camp. They realize their father had taught them different knots based on their vastly different personalities, with Andrea's need to keep the fish, and Amy's to throw them back.

One night, while the group dines on Andrea's and Amy's freshly caught fish, walkers attack the camp, and Amy is killed. Andrea stays with her sister's body until she resurrects. "I'm sorry for not ever being there," Andrea says before shooting Amy in the head. "I love you."

Amy's death takes an emotional toll on Andrea. Dale commiserates with Andrea, and when the group heads to the CDC tries to convince her that they can have a fresh start. "There's nothing left," Andrea counters — a fact soon realized when the CDC is set to self-destruct due to power loss.

Andrea opts to stay in the exploding building. Distraught, Dale says he's staying too, refusing to go back out into the world alone, arguing, "You don't get to do that. Come into somebody's life, make them care and then just check out." Moments before the CDC explodes, Andrea and Dale emerge from the building.

Video: Who Is Andrea? »