I always thought it was an intruder. My hunch was it could have been the border across the street who walked their dog. I seem to remember that he had been in the Ramsey home at some time. Didn't he drop in on their party? Anyway, he recently had some family difficulties. It's been years, but I seem to remember he had recently lost his son from an accident, or a murder, and also lost his business shortly before he moved in across the street as a border. He moved away (somewhere out of state) shortly after JonBenet was murdered. I always suspected that it was him. Don't remember his name, or the people he bordered with. I never believed the parents were involved, but whoever it was, was certainly in a very bad state of mind.