My own worst enemy

Jessica was a very popular, tough, cold, badass detective who was living in L.A. She and her partner Vincent had solved many crimes through their careers. One day a case so disturbing was given to them that no one could believe that a human being could do that to another. That monstrous action made Jessica decide to catch that killer no matter the cost, even if that cost was her own life. Did she catch him or did she lose herself trying?