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Married couple decided to look at a sample home in a ranch housing development in mckinney, texas. when they walked into the sample home, they couldn't find the sales associate. but they knew right away that something was wrong. >> and they walked into the living room, and then they saw a blood trail leading into the kitchen. >> and that's where they found the sales associate, sarah walker, in a pool of blood. >> the victim was stabbed 27 times. there was an incredible struggle. >> furniture and plants were knocked over. it looked like the victim fought for her life. >> it just didn't happen i...

The man nelson saw that day. >> i was saying that with these facts and the sketch, we'll hit jackpot. >> the composite drawing kind of brought the case back to the front burner again, because for awhile, we had nothing. >> the sketch was released to the media and immediately produced results. yet another local real estate agent said she recognized the man. she rented a home to him. and she said once he came to her home asking to use her phone. when she refused to let him inside, he grew angry. >> he was banging on her back door, and now she's terrified. her dog's going crazy, this guy is now i...

On that tragic day in mckinney, texas, the evidence shows that kosoul called his first target, asking her to meet him at the model home. but she sensed trouble and brought her husband, which frightened him away. >> excuse me, sir. are you chan lee? >> but kosoul didn't give up. he saw there was another model home across the street, and he saw sarah walker arrive for work. >> oh, you know what? somebody just walked in. won't be able to stay on the phone. >> prosecutors believe he went inside and tried to rob sarah. >> give me that watch. >> there was a fight. while trying to subdue her, kosoul ...

>> 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 looked through a book of photographs to choose the most similar. >> every one -- if you look closely, they have different...

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 requests. 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 husband of another realtor, came forward with some new information. he said on the morning of sarah's murder, his wife got a call from a man who identifi...