diane parrish, who lived a few houses from nathan and denise, remembered seeing a strange man on herright around the time of her murder. >> describe the man you saw walking along this road? >> he had a black hoodie sweatshirt on with the hood pulled up, and his hands were in the pocket. i will never forget the look on that man's face. >> what was so odd about the look on his face? >> he was very agitated. i knew immediately something was wrong with him. >> neighbors were anxious, and detectives were puzzled. denise's neighborhood was normally very quiet. not the type of place you'd expect a burglary, even if she had accidentally stumbled upon an intruder, how had it turned so vicious so quickly? >> why would somebody want to turn it to this particular house? >> it's not typical as far as a burglary that results in a murder. >> maybe it wasn't a burglary at all. coming up, if it wasn't a burglary, what was it? was nathan's life also in danger? >> nathan's parents told me nathan and three children have been moved to a safe house just to protect them. when dateline continues. hospitaliz