Police: 6 California killings may be work of serial killer


              In this undated surveillance image released by the Stockton Police Department, a grainy still image of a “person of interest," dressed all in black and wearing a black cap, who appeared in videos from several of the homicide crime scenes in Stockton. Ballistics tests have linked the fatal shootings of six men and the wounding of one woman in California— all potentially at the hands of a serial killer — in crimes going back more than a year, police said Monday. (Stockton Police Department via AP)
            
              In this undated surveillance image released by the Stockton Police Department, a grainy still image of a “person of interest," dressed all in black and wearing a black cap, who appeared in videos from several of the homicide crime scenes in Stockton. Ballistics tests have linked the fatal shootings of six men and the wounding of one woman in California— all potentially at the hands of a serial killer — in crimes going back more than a year, police said Monday. (Stockton Police Department via AP)