Natalie convinced Ian to reach out to Haley Tyler, Ian's illegitimate daughter, who has the same rare blood type as Ian. Natalie, a retired doctor, gave Haley an injection and told her that it was for medical research. In actuality, Natalie was poisoning Haley's blood so it would also poison and eventually kill Ian when it was transfused to his body. In an earlier interrogation, Natalie stated that she gave up 20% of the inheritance to Haley, but as revealed later on, she did so mainly to maintain Haley's trust, as well as keeping Natalie's villainous motives a secret from Haley.
In order to prevent Haley from finding out the truth about her illness, the evil Natalie killed Haley with a single stab wound and tried to make it look like a botched robbery, but when Haley fell off the balcony instead, Natalie fled the scene. Natalie was arrested for killing Haley and Ian.
- Margaret Colin also played villainess Ms. Krug on Law & Order: SVU.