What if....an intruder killed JonBenet? My theory would be that if an intruder killed JonBenet, he/she would have planned it ahead of time. My reasoning is this...this intruder either had close contact or a close relationship with JonBenet. It would have had to been a neighbor since JonBenet was always with a grown-up when she went places. However; she did ride her old bike up and down the street and someone started coveting her. They watched her every time she was outside...and then their fantasies started growing stronger. Christmas night this intruder decided to pay a visit to JonBenet. This murder by an intruder would be somewhat similar in the Danielle Van Damm case because the monster David Westerfield used to watch Danielle play and look through her bedroom window with his binoculars. David Westerfield was coveting Danielle Van Damm. He finally made his move.