Newton's Third Law of Motion

Just a short story I had to write for my literature class. Dark Romanticism, Vengeance, Psychological piece. Rated T for blood.
Renata Phoenicia had everything: a loving boyfriend, a passion and talent for rock climbing, her own personal library of books that she read and had yet to read. But everything changed on November 5th, 2010, at 3:07 am, when a mysterious man murdered her in a dark alley. What will her grief-stricken boyfriend do?