The episode "Night in Question" opens with Nick Knight being wheeled into the Emergency Room. When his partner, Tracy Vetter is questioned about her partner's injury, she explains that she received a message from an ostensible informant who claimed to know the identity of a serial killer dubbed the "Yorkville Ripper". In order to get the information, she had to meet the informant in person at the Parade Warehouse. She did not, of course, go alone: she took her partner with her. But they were ambushed as they made their way through the dark building; and Nick was shot.