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>> norman said he had nothing to hide and tried to be helpful. he told detectives he did have plans to see brittany the night she was killed but ended up going straight home after work and then spent the night with a friend. he gave police his phone so they could search his car, and when they wanted dna from him. >> i'd like to get a saliva sample from you. >> he let them take a sample immediately. >> that night detectives drove norman to his house to collect the clothes he'd worn the night before. then it was back to headquarters for another round of questioning. it had been a very long day. ...

Was killed but ended up going straight home after work and then spent the night with a friend. he gave police his phone so they could search his car and when they wanted dna from him. >> i would like to get a saliva sample. >> he let them take a sample immediately. that night, detectives drove norman to his house to collect the clothes he wore the night before. then it was back to headquarters for another round of questioning. it had been a very long day. norman felt he cooperated every step of the way. but by now he'd reached the end of his rope. >> i'll give you anything i want. i'm giving y...

The trail kept getting colder. in 1993 sherri's parents would pay for the bite mark for dna but the blaped lapd declined. >> she said we don't have a suspect. if we had a suspect we would have something to match. >> reporter: so the case set for another decade. in 2004 the lapd was conducting cases on cold cases and one of them was the murder of sherri rasmuss rasmussen. it took two months to find that saliva sample buried in a refrigeration unit. the saliva was still inside and the dna was just enough to blow this case wide open. >> in that lab report, it indicated that the suspect that

For norman downtown at police headquarter. >> you have the right to consult what i -- with a lawyer. >> he didn't ask for a lawyer. >> i want to make sure you city want to talk to me. >> yeah. >> norman tried to be helpful, he said. he told detectives de have plans to see brittany the night she was killed but ended up going straight home after work and then spent the night with a friend. he gave police his phone so they could search his car and when they wanted dna from him. >> i would like to get a saliva sample. >> he let them take a sample immediately. that night, detectives drove norman to...

The trail kept getting colder. sherry's parents offered to have the saliva sample of the bite mark tested for dna, they even would pay for it and the l.a.p.d. declined. >> they said, we don't have a suspect, if we center a suspect, and we have their dna, then we have something to match. >> and the case sat for another decade. then the newly formed cold case unit was conducted dna tests on unsolved cases and one of them was the murder of sherry rasmussen, it took two months to find the saliva sample, buried in a refrigeration unit, the vial was poking out and the label torn but the saliva was s...