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He was the one with the weak alibi. and detectives had already cleared his sons, though the prosecutor called them as witnesses anyway. >> during the school week, what time would you normally go to school? >> it was just after 9:00. >> on december 1 of 2011, did you work that day, a thursday? >> yes, i was. >> reporter: and someone else cleared by his alibi, john kenlein, the married teacher, was forced to appear, admitted an affair with chanin. >> we engaged in a sexual relationship yes. >> he was not here to be shamed but to testify about curious messages he received from chanin's phone, mes...

Phone. you could definitely hear a female's voice kind of urgh. but that's all it amounted to. >> reporter: but who was the attacker, the car salesman, the teacher, or somebody else? now the investigators had to go back over those alibis and compare them to the time of the 911 call. they started with the salesman, tom walker. were you at work all day thursday? >> except for the funeral. >> reporter: his phone never pings off any of the towers in the deer park region. he's at work on december 1st. he attends a funeral. we confirmed that. >> reporter: the salesman, the guy who sent that racy req...

Clay's. he was the one with the weak alibi. and detectives had already cleared his sons, though the prosecutor called them as witnesses anyway. >> during the school week, what time would you normally go to school? >> it was just after 9:00. >> on december 1 of 2011, did you work that day, a thursday? >> yes, i was. >> reporter: and someone else cleared by his alibi, john kenlein, the married teacher, was forced to appear, admitted an affair with chanin. >> we engaged in a sexual relationship yes. >> he was not here to be ashamed but to testify about curious messages he received from chanin's p...

>> i was able to eliminate tom walker. i was able to eliminate john kenlein. >> reporter: so one name they hadn't quite been able to cross off their list seemed more and more important. >> clay starbuck was never eliminated as the suspect. >> reporter: clay starbuck, the ex-husband, and by now they had something else to consider -- a slew of unflattering tidbits from chanin's family. >> he was constantly trying to belittle her and make her feel like she was inanimate. >> i always thought he was a creep. >> reporter: those dental school classmates were eager to pass on a few of the stories chan...

I asked him for his name, who it was that i was speaking to. >> reporter: sounded a bit shady to the investigator. distrustful. >> it was obvious that he didn't seem to believe that i was with the sheriff's office either. >> reporter: mike griffiths was listening in on the conversation and scribbled a note. >> tell him that we need to have his true identity shortly or i'm going to post this picture and show it all over the media and i'll find out who he is. >> at that point he told me his true name. >> reporter: suddenly wanted to cooperate. >> well, he didn't really want to, but he expressed ...