aggressive tone of his interrogation. there was more to learn about this closed off young man, for whom questions about knives would have an extra special meaning. reporter: coming up someone offers a new and unsettling portrait of nathan s relationship with shelley. nathan was actually stalking shelley everywhere she goes. matt: whoo! whoo! jen: but that all changed when we bought a house. matt: voilà! jen: matt started turning into his dad. matt: mm. that s some good mulch. i m awake. but it was pretty nifty when jen showed me how easy it was to protect our home and auto with progressive. [ wrapper crinkling ] get this butterscotch out of here. progressive can t protect you from becoming your parents. there s quite a bit of work, cause this was all this was all stapled. but we can protect your home and auto when you bundle with us. moderate-to-severe eczema, or atopic dermatitis, you never know how your skin will look.
dna confirmed that that blood come from shelley. and then then you have to sit back, scratch your head and say, well, i wonder if both these guys did it? and then if if you go with that theory, what is the motive? robbery? no. rape? no. i mean, how would you get these two people on the same page to kill this young girl? reporter: there was one other possibility did daniel frame nathan by planting that bag in his bathroom? after all, he lived in the same apartment. so, detectives went about the painstaking work of verifying every moment in the lives of those two young men on the day of the murder. and nathan was a hard, hard suspect.
to you, this one? well, you know, i ve got two daughters. and yeah, it s it s hard. reporter: shelley died here, in the falls , a large housing complex where the art institute arranged for some of its students to live. seemed like a perfectly reasonable place, looked quite safe, when we stopped by to take some pictures one sunny afternoon. about you, i wouldn t let my daughter live there. reporter: really? absolutely not. reporter: dallas, like any big american city, suffers from its share of crime. and the falls? you go there during the daytime, it looks very nice. but at nighttime, totally different story. reporter: innocent 20-year-old girl out on the street in that neighborhood at night, you d worry about her? no way would i let my daughter walk that neighborhood at night, no way. reporter: the nances didn t know any better. little italy, after all,
murder, as the detective knew very well. he confronted nathan. shelley told her mom that she told you that ya ll were through. no. ah, yeah. no, she didn t. her mama told me that. son, i talked to her mama. don t call me a damn liar! i just talked to her mom her mama, shelley told her mama that ya ll had had nothing in common. and that it was over. that it was through. [ shakes head ] she never said that. boy, you sound like mad. you re a damn psychopath. are you like coo-coo-coo and la la land? does [ expletive ] not register to you? nothing makes sense. i m just i m just waiting to wake up. that s right. you re waiting to wake up. now, what did you do with the knife? i wasn t there. nathan, you i didn t do anything with a knife. yeah, you did. reporter: detective ellzey made no apology for the
video games. you never tried anything sexual with her? [ shakes head ] she never tried anything sexual with you? did you kiss her? no, never. you never kissed her? she s been your girlfriend two months and you never kissed her? [ shakes head ] why? it s weird. it was my first girlfriend. reporter: detective ellzey had never heard of a college romantic relationship like that. question was, could he believe it? how many 19 and 20-year-old people proclaim to have a girlfriend or boyfriend who have not kissed them? reporter: nathan also said he hadn t seen or spoken with shelley since several days before the murder. in fact, he said, he spent much of the week back home with his mom and grandmother. was he telling the truth? standard procedure detective ellzey checked out nathan s body for scratches. all right. turn around. okay. come back around again. how did you get those scrapes right here, them scratches?