Dateline | January 11, 2013
>>> it's hard to tell from this video, but the prime suspect in michelle le's disappearance,
>> we have a young lady who disappears from a public place. automatically our minds went to is there more than one person involved?
>> so when richey got a call from michelle 's ex-boyfriend claiming to have found michelle 's iphone he was worried.
>> i was very concerned that had we missed something? is he the other part of this? then why is he telling us this if he is the other part of this why is he finding this and telling us about evidence?
>> that was the key question. why would scott admit to having incriminating evidence ? was he trying to outsmart the cops by pretending to be helpful, to have found michelle 's iphone when he had it all along or was he afraid? afraid someone was trying to set him up which might have been the reason why scott shared this document with detectives. this is a temporary restraining order against giselle esteban . in signed declarations both scott and his mother told how his family was awakened one morning by scott 's car alarm . scott went to investigate.
>> while he's out front he hears his mother screaming. he goes inside and giselle is inside of his house. she's inside his room tampering with his computer.
>> sound familiar? it was the same thing esteban was doing at the nursing school .
>> and when was this?
>> four days before on a tuesday. there was something else. a i piece of evidence you have to hear to believe. scott told the detectives that four months before michelle 's disappearance, giselle harangued and threatened him, verbal attacks so alarming he recorded some on his iphone just in case something bad ever happened. this one in a parked car. their small daughter sitting in the backseat listening. you listen closely. you're about to hear the real giselle esteban .
>> i asked you, can we just be honest about michelle because she's the one issue that i really, really am having a hard time dealing with.
>> that's not what you said at all.
>> starting from now, we are going to be honest about michelle , do you understand me? whether you sleep with her, whether you share food with her, whether you talk to her. you will be honest with me. look at me! you will be honest with me regarding her otherwise i will take you and hers and you can take that to the grave.
>> why? because you lied about her so many times it's hard to believe that you didn't sleep with her. you deserve to die for your lies and she. this is your last and final warning .
>> do you understand me? this is your last and final warning .
>> detective richey listened to her go from furious to threatening and this was far from the subdued woman he met back in may.
>> it was apparent that she was a violent person.
>> did you ever have any concern about scott 's safety?
>> yes. and we advised scott that, if it is giselle you have to be concerned for your safety as well.
>> he might well be a target.
>> esteban had become fixated on her old friend and was convinced that michelle had somehow broken up her relationship with scott and yett as richey took pains to discover. michelle and scott were nothing more than just friends. scott was just one of the many friends that she had. the only person in this world that seemed to think there was more to it was giselle .
>> prosecutor butch ford heard the audio, too, and read the 1500 pages of texts and e-mails scott gave police.
>> for the better part of six years she had an obsession with michelle . her text messages were filled with hatred toward michelle at every step of the way and then towards the -- the last four months and so they were filled with hatred toward scott . wishing him -- wishing his death.
>> they were just filled with hate toward the two of them with blame towards michelle for ruining her relationship and essentially breaking her family.
>> do you think there's any truth to that at all?
>> only from the standpoint that giselle believed it was michelle 's fault. so in terms of responding to that question, the answer has to be yes, there's truth to it --
>> from her perspective.
>> because she had to blame somebody.
>> this is a very disturbed individual.
>> yes. no question about that. from my perspective, when we're dealing with, in particular murderers, my position is they're all sort of screwed up because the normal person doesn't react that way. we have to believe that, right? the normal person doesn't react that way. at some level any time one person commits a murder there is a screw loose in their head. there has to be.
>> butch knew about the parameters of human nature . he helped raise eight younger siblings while growing up in south central l.a. and worked his way through law school and now as a prosecutor seeks out advice from someone who has seen it all, his own grandmother.
>> i have dinner every wednesday at my grandmother's house. the first female african-american judge appointed in alameda count.
>> i've never hadda i case that i haven't spoken to her about and run ideas in terms of trial presentation and closing argument and things like that. i always run it by her.
>> this case was special.
>> ford's grandmother was struck by the determination to find answer, but it was clear there was still too many questions to take this case to court.
>> the theory was that giselle had done something to bring about her demise. it was a question of what -- what and how we prove it. in fact, without a body, how could they prove there was a murder at all?
>> coming up, in a strange twist of fate , the mother of amber dubois joins another search for michelle along with her new dog.
>> she jumps up on me and takes off again and i followed her and i noticed sticking out of the ground.
>> a dramatic discovery when "dateline" continues.