If you want to kill somebody and get away with it, look at the people who got away with it: Jack the Ripper did a fine and dandy job by knowing the neighhorhood well, killing his victims, and just leaving them there. Ted Bundy wouldn't have been caught if he hadn't let Carol da Ronch escape his VW bug: grab your victim, render him unconscious, and transport him to a spot deep in the woods to finish the job, leaving the evidence there. The Green River Killer excelled at body disposal: choose an openly accessible, but too large to patrol all the time, area and dump the bodies there. The key is to kill a stranger, and have only *one* crime scene: murder and disposal in approximately the same place. When you have secondary and tertiary crime scenes, you're just creating more places to leave evidence.