Not much is known about Kathy's life before the apocalypse except that she may have lived in or around the Washington D.C. area before the outbreak.
Kathy is first shown when Tara is being held in a cabin, Beatrice questions her with Natania and Kathy. That night, the women have supper and attempt to persuade Tara to stay with them in Oceanside. However, Tara wants to go back home to her girlfriend and the womens offer to escort Tara back to the bridge where she last saw Heath.
While in the woods, Tara catches on to the real plan: Kathy and Beatrice are going to kill her and manages to flee from them, but Beatrice finds Tara and the women scuffle. With her rifle aimed at Tara, she is knocked out by Cyndie. A short time later, Beatrice and Kathy arrive at the bridge and bring Cyndie back home after Tara successfully escapes.
Kathy appears when bombs begin to go off in the outskirts of Oceanside, as she is running she is stopped by Daryl, as is told to put her hands behind her head. She obeys him and is brought to the woods with the other Oceanside residents.
When Natania and Cyndie talk about fighting the Saviors, Kathy seems somewhat interested, however it is unknown if she was willing to join the fight. Shortly after, she is among the survivors to help defend the Oceanside residents from walkers.
After the deal is over, Kathy watches as the Alexandrians take their guns.
Kathy is present when Cyndie must decide whether to kill Aaron and Enid or not, and Rachel suggests that they kill them, but Cyndie lets them live, and Kathy, along with the Oceansiders escort Aaron and Enid out, refusing to join the fight against the Saviors, and warns them never to come back.
Kathy is seen with the women of Oceanside returning from fishing, an emaciated and weak Aaron kills a walker that appears nearby before collapsing. Having been spotted in the area often by the women, Aaron is ignored except for Beatrice to tell him to find something to drink.
Later, Kathy and the residents find an exhausted Aaron, begging them to join the fight against the Saviors as they would otherwise continue to be fearful of the outside world.
Kathy alongside Rachel, Cyndie, and the rest of Oceanside threw Molotov cocktails at Saviors coming to ambush the Militia at the Hilltop and most likely helped rebuild the communities.
This list shows the victims Kathy has killed:
- At least 12 unnamed Saviors (Alongside fellow members of Oceanside)
- Numerous counts of zombies and unnamed people.