Jimmy Chang is a Crime Scene Photographer with the San Francisco Police Department. He accompanies SFPD Homicide Detectives "Pookie" Chang and Bryan Clauser on the scenes of the gang murders that have been affectionately termed the "Piss Man" cases. He is on site for both the aftermath of the LiPo Lounge attack and the Alex Panos murder scene. Jimmy is the first to notice that the severed fingers found on the Alex Panos murder scene were used as writing instruments on the wall.
The author refers to this character with only the full name of Jimmy Chang. Although Jimmy appears to be a possible derivative of James, no confirmation of this hypothesis is given.
No specific description of Jimmy’s appearance is ever given in the novel.
From the minimal information given of Jimmy, he appears to be an amiable character.