Well, this isn\'t quite serial killing. Serial killers have a certain "relationship" with their victims. Also, their victims have things in similar to other victims. These two, were more like on a killing spree. The first day they killed 2 and the second day they killed 4 more, I think. After that, it was one victim at a time once the cops and the residence were on a look out for suspicious people and anything that sounded remotely close to a shot.