Stephanie Mulroney is the daughter of socialite Regina Mulroney and the murderer of Stephanie's ex-fiance, Dean Woodruff. The murder was covered up with the help of mobsters by disguising it as the crimes of Arthur Pruitt. (SVU: "Entitled")
The cover-up was revealed, and Stephanie was arrested and put on trial for murder and obstruction of justice, Regina being charged as an accessory. An emotional defense in court lead to the family's acquittal. (L&O: "Entitled")