Mary

Mary was a nurse working at CTU Los Angeles during Day 4.

Day 4
Mary gave a patient, Maya Driscoll (the daughter of CTU Director Erin Driscoll), some medication. Later, Maya nearly died after having an allergic reaction to Haldol. Dr. Mark Kaylis had glanced over some kind of paperwork error, and the pills which Mary gave Maya could have been the dangerous drug. Dr. Kaylis, Mary, and some other medical staff helped revive Maya.