S6, E12: A gang member falls to his death from the roof of a building in a bad neighborhood. He had deep bite marks on his penis and appeared to be in the process of raping someone when the accident occurred. The cops believe the victim is in danger - marked by gang members for death. They think a homeless deaf/mute named Katie (Regan Thompson) was the victim, but before they can question her, a gang member kills her. Her death is in vain however, because the M.E. determines that the rape victim was a male.