- "There's no time, Tom. I tried to warn you. Now it's too late."
- —Katie, appearing to Dr. Sciarello
Katie worked as Dr. Sciarello's assistant for five years.
When Brant Harris, suffering from insomnia and likely dementia assaulted Dr. Sciarello after hours and held him hostage, Katie notified P-Sec immediately. Despite the dangerous circumstances, she remained at her station until the officers arrived to deal with Harris. Shortly after, they started trying to talk to the deranged miner. However, he opened fire with his line cutter missing the officers, but striking Katie, effectively cutting her in half.
Katie reappeared later as a hallucination to Dr. Sciarello, pleading for him to protect the Marker. Her body was placed in the morgue where it awaited transport to be brought onto the Ishimura. When the Marker was taken off the planet and the infestation of the colony began, she appeared once more to Tom, telling him that she tried to warn him and it was too late for all of them.
- Katie was the first individual killed in the course of the Aegis VII incident. Similarly, she was also the first person to be slain by a Line Gun and first person to be killed by another human being.