lester holt: coming up the strange video trail of giselle esteban the day before michelle disappeared. fraser ritchie: it shows giselle walking around with a lab coat on pretending to be an instructor. keith morrison: weird. yeah. lester holt: what was she up to? when dateline continues. [music playing] tired of wrestling with seemingly impossible cleaning tasks? using wipes in the kitchen, and sprays in the bathroom can be ineffective.
but they didn t know how she did it, or when she did, or where she is or, more important, what she did with the body. if you don t have a body, it makes the case more difficult. keith morrison: and so, ritchie and the other investigators with the hayward pd continue the tedious work of building a murder case without a body. they ran fingerprints, they sent dna out for testing, they interviewed witnesses all quietly, out of sight of the family and press. they tested a strand of hair found in michelle s car it turned out to be giselle s. some of her touch dna on the turn signal too. but since the two knew each other, that wasn t enough evidence to make an arrest. so they checked giselle s cell phone records found that her phone, like michelle s, left a trail in the hours after michelle vanished. and what do you know? the location that michelle s phone went, giselle s phone also went. as if they were traveling together.
by entering this break room. and then at 5:30 in the evening, when the campus is closed, she gains access through the back door using that electronic key card. same swipe card. yes. throughout the campus, there are in the classrooms and in the hallways there s cameras. and it shows giselle walking around with a lab coat on, her glasses up, and she s going around turning on computers. keith morrison: weird. yeah. keith morrison: giselle can also be seen with a class roster stolen from an instructor s office. and you can see the class roster, because it has all the students photographs on there so it s not just typed. keith morrison: yeah. fraser ritchie: it s photographs, so you can see that it s a class roster. and it looks like she s walking around as if she s pretending to be an instructor, or something like that. she s in samuel merritt for an hour and a half, or so, and then she leaves. keith morrison: all of this, the night before michelle le disappeared. what was giselle doin
that michelle would possibly be. keith morrison: but that didn t happen. not to say, though, her behavior wasn t suspicious. remember the vigil the le family held a week after michelle s disappearance? the one attended by giselle s ex-boyfriend, scott? it turned out, giselle was there too sort of. the tracking device showed giselle circling the block as michelle s family pleaded for help. and later, it showed her driving past scott s house. why? ritchie was all but re now giselle had something to do with michelle s disappearance. the question now was, did she have some help? it was something that we had to look at. if so, who? yeah. dive into her life who s her friends? and who can we talk to that knows giselle? keith morrison: ritchie consulted an alameda county assistant da, now deputy district attorney, a guy named butch butch ford. some of my colleagues, their response was,
it was something that we had to look at. if so, who? yeah. dive into her life who s her friends? and who can we talk to that knows giselle? keith morrison: ritchie consulted an alameda county assistant da, now deputy district attorney, a guy named butch butch ford. some of my colleagues, their response was, well, who helped her do it? because she s a woman, she s pregnant in order to do this, she had to have help. keith morrison: prosecutors had a hard time believing esteban was physically capable of killing michelle le all by herself. we encouraged them to make sure they eliminated any possible suspects, such as the father of giselle s child. keith morrison: that would be scott, the ex-boyfriend, butch is referring to. and so, everybody s antenna went up. in late july of 2011, 63 days after michelle s disappearance as the le family searched the hills for her ritchie got a very strange phone call from scott