The University of Southern California's Department of Public Safety is mourning the death of their officer who was killed by Christopher Dorner .
Officer Keith Lawrence, 27, who had worked for the university since August, was shot and killed by Dorner on Feb. 4 in Irvine, Calif., along with his fiancé Monica Quan, 28. The double homicide prompted a massive manhunt for Dorner, which ended last week after a shootout and fire at at Big Bear cabin.