Thanks for your post, good suggestions. I agree that the escape route of the killer would be my choice of the most important aspect for investigation. IMO guessing at and following potential motives, in these kinds of cases, leads the investigation astray. For eg I was reading recently about the Sharon Tate murders, investigators ignored a gun that was found on a nearby property, they were convinced the murders were related to drug use and drug gangs. It struck me as extremely odd the motorcyclist was only tracked down 2 or 3 years later, and then ruled out. Why didn't he contact police earlier? How could it have possibly taken that long to find him, why were they so positive he wasn't involved?? Was he the only motorcyclist? Unfortunately we have no answers.