Mary Kostrinski is a mob hitwoman for Jimmy Scanlon and the murderer of bagman Thomas Duff. Scanlon had killed Kostrinski’s abusive husband for her and called upon her for the favor of Duff’s murder.
Kostrinski tried to argue self-defense against sexual assault to justify her shooting, until her connection to Scanlon was revealed. She was found guilty and imprisoned. (L&O: "Point of View")