"Big Kate" O'Malley is a citizen of Rapture. She was a supervisor of the maintenance workers at the Adonis Luxury Resort and was also familiar with the mechanical infrastructure of other parts of Rapture, including Dionysus Park. She alerted Bill McDonagh of the dangerous flaw in the park's structure, but she was unable to stop the incident that resulted in its flooding. O'Malley tended to have an ill temper towards lazy workers and sometimes negatively referred to the upper class citizens of Rapture as "rich pricks."