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The home where sarah was killed. >> she felt a little suspicious about him and wondered if he was legitimate. and she tried to call the hotel he said he was at to find out what time he was coming, and he was not in the room that he said he was in. >> in fact, no chan lee was registered at the hotel, but she still agreed to meet him. >> remember when you're in the real estate business, you're in the business of making a commission. so you're going to accept all comers. >> the realtor did take precautions. >> my wife asked me if i wanted to come along, and i said yes, and i did it for my reasons...

Always the risk of danger. >> think about it this way. if i exchange one e-mail with a random stranger or if i just write something like no, thanks, i'm not interested. you have a suspect right there. if you return 30 or 40 no thank yous in a week, and trust me, women get inundated with that many questions. well, you've got 40 suspects. >> investigators interviewed all the men sarah spoke to from the site. each provided a dna sample and all were eliminated. by this time, several weeks had passed. and the trail of sarah's killer was turning cold. then unexpectedly, nelson villavicenzio, the hus...

>> under hypnosis, the images in your mind, the remembrances become so clear that i've got lot of faith in his hypnosis. >> the memory is already there in his mind. the memory, i'm not placing a memory in his mind. it's already there. we're just actually going back and revisiting that day and time. >> the hypnotist wanted nelson to think of the incident as if he were watching a movie. and then freeze frame the image of the man he saw at the model home. nelson described the suspect as asian, muscular, around 27 years old, 5'7" tall with a buzz hair cut. after he described each feature, he then ...

Way you could describe it. you could eat off the floor. >> you'd walk into her house. it was like a model home. nothing was out of place. she was constantly picking up after everyone. >> in fact, detectives also found plenty of evidence of christie's clean and organized life. her closet full of clothes perfectly organized along with lists of every outfit and what to wear with them. even her jewelry box was in ideal order. not a bracelet out of place. but neatness wasn't christie's only compulsion. from an early age, she was also extremely security conscious. >> my dad raised both of us girls t...

150-square-foot home. foyer/dressing room/closet/pantry. /kitchen/bathroom. you can almost from the bathroom reach in and grab something from the fridge. that's convenient. welcome home. a model home in berkeley, california, to be exact, where everything is always within arm's reach. a home that is smaller than the average office cubicle and about half the size of most parking spaces. >> we have a foot rest or a coffee table. >> reporter: but my feet are in the kitchen now, and i'm sitting on my bed/couch. this may be the future of city living. san francisco is considering allowing some of the...