Margaret McKenna

Margaret McKenna  is the main villainess from "See No Evil," the third episode of Criminal Minds: Suspect Behavior.

She was played by Justine Bateman.

Margaret McKenna was a nurse at Hope Memorial Hospital in Tucson, AZ, but before that, she worked as a nurse in several hospitals in a 15 year span. In every hospital she worked in, there were complaints of patients becoming infected, with the complaints sent anonymously. It was revealed that Margaret purposely infected the patients and reported them herself, seeking to be hailed as a hero and crusader. However, while doing the same thing to patient Steven Lawford at Hope Memorial, Margaret's attempt came too late, as Steven passed on and his widow agreed to a settlement.

To further her message, Margaret became a serial killer, with Kenneth Richards as her first victim. In the beginning of the episode, she sought out Kenneth while having car trouble, injecting him with a paralyzing drug before cutting his eyes out. Her next victim was Karen, a nurse at the same hospital, murdering her with an ice pick in her ear. Margaret's murders had a theme: see no evil, speak no evil, hear no evil, and her latest attempted victim was the hospital's lawyer, Allison Gilroy. While at Allison's office, Margaret attempted to cut out her tongue, but she was stopped in time and arrested. During her interrogation, Margaret defended her cruel actions, continuing to claim that she saved lives.