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Perhaps at least some of them may have had a motive to harm her. three of them we eliminated almost immediately for insufficient motive. >> reporter: but there were still two names left. one of them was a coworker. >> a woman named debra that worked with sherri rasmussen in the hospital. this person of interest was later placed by sherri rasmussen in an official capacity and problems followed almost immediately after that. >> reporter: so there was bad blood wean them? >> there was a motive. >> reporter: debra had moved to northern california. nutall asked local law enforcement to watch her an...

Lazarus. >> reporter: that was the other name on the short list of suspects. nut consist all pressed ruetten for more on their relationship which had started when they were both students at ucla. they dated on and off until john got engaged to sherri. even though you're convinces the relationship that john had with stephanie lazarus overlapped with the relationship he had with his wife? >> we know from john that there was at least on one occasion where he was engaged that he was intimate with stephanie lazarus. there was a love triangle and stephanie lazarus had deep feelings for john ruetten ...

Cops tracked down debra and secretly scooped up a sample of her trash which contained dna. it was sent to the crime lab in l.a. for analysis and 72 hours later, came an answer. >> she was not the donor of the dna profile from the bite. >> reporter: that left just one possible suspect, number five on the list, john ruetten's ex-girlfriend stephanie lazarus. nutall called the rasmussens. >> we came home and there was a message on our phone from a detective that they wanted to talk to us. i thought oh, yeah, right. i thought it was just another false hope. >> reporter: this is detective nutall? >...

Least some of them may have had a motive to harm her. three of them we eliminated for insufficient motive. >> reporter: two names were left. one was a co-worker. >> a woman named debra, she was replaced by sherry rasmussen in an official capacity and problems followed after that. >> reporter: there was bad blood between them. >> there was a motive. >> debra moved to northern california and he asked law enforcement to watch her and secretly try to snag a sample of dna for testing. he learned about the second woman. he contacted sherry a's -- sherry's former husband and -- >> stephanie lazarus, ...

He pressed for more on their relationship which had started when they were students at ucla, they dated on and off until john got engaged to sherry and even then -- you are convinced that the relationship that john had with stephanie lazarus overlapped with his wife. >> we know he was engaged and he was intimate with stephanie lazarus, there was a love triangle and stephanie lazarus had deep feelings for john rutten and may have had a motive to harm sherry rasmussen. >> reporter: was sherry's killer a scorned lover or a jealous co-worker. >> we had two women on the list that had a motive. >> d...