McCullough is shown to be laconic and serious. She does not tolerate the boorish and often sexist antics of her male co-workers. It is implied that she is slightly racist towards black people.
Physical Appearance Edit
McCullough is caucasian and tall and blonde. According to a Corrections Officer, "She could totally be cute if she got, like, 'Princess-Diary'ed".
Before Litchfield Edit
Before she came to work at Litchfield, McCullough served in the armed forces in Afghanistan.
McCullough is one of the new guards hired by MCC in order for the corporation to receive financial incentives for hiring veterans.
She escorts Maritza on van duty, foiling Maritza's original plan to charm one of the male guards into going into the house while Maria's cousin picked up the panties hidden by Flaca in the bottom of the vehicle. The two eventually form a bond, and Maritza agrees to give McCullough makeup tutorials.
While she can be uncaring towards many of MCC's policies and her fellow guards' activities, she shows concern when she overhears Maritza throwing up in the bathroom (after CO Humphrey's torture). Recalling that Humphrey improperly had Maritza in the guards' house alone, she wonders if he may have had something to do with her state, and she and Stratman discuss Humphrey's possibly sociopathic nature. They consider that Humphrey may have raped her, and worry over the implications for the rest of the guards. She debates reporting the incident but Stratman sways her decision. He explains that they are part of a "brotherhood", meaning they have to look out for one another. McCullough reluctantly agrees and chooses to remain passive on the situation.
When the guards begin shutting down the peaceful protest in the cafeteria, McCullough attempts to assist Baxter Bayley in apprehending Suzanne Warren, but she is unsuccessful and calls out to Piscatella for help.
When Caputo asks the guards if Poussey was violent following her accidental death at Bayley's hands, McCullough and Luschek are the only ones who do not respond in the affirmative, clearly disturbed.
At the end of Season Four, McCullough is shown being held at gunpoint along with Humphrey by inmate Daya. The scene ends on a cliffhanger.