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Happened. her boyfriend, a man named thaddeus rice, had dropped the baby down the stairs after tripping over a diaper bag. >> jordan was crying and halee looked at me. i was like, what are we going to do? let's get jordan under control, let's calm her down. and halee put the mom skills into very good use and she is like, it will be okay. he'll pull out of this. he is so strong and all this stuff. >> they did what they could to help. they got jordan some food and went to her apartment to get her some clean clothes. >> we walked in and halee is, do you know what's weird? what? the diaper bag is ...

>> he texted her that morning after the body's been found saying, are you okay or something to that effect. he knows she's never going to get the message because he threw her phone out the window. >> so you believe he was establishing some type of an alibi. >> he was trying to lay down an alibi at that point. >> detective kruse raised the heat again. >> it does not make a damn bit of sense. >> he tag teamed with other investigators to get isaiah to confess. >> we're trying to find out why you did this. why? >> i didn't -- i didn't -- i would never hurt halee or do anything to her. >> isaiah st...

When that happened cell phone data showed isaiah was miles away. >> at the time that her phone came back on and started traveling it was nowhere near isaiah hagan. in fact, he was in a different county. so he could not have been pinging off the same tower that she was. >> reporter: which according to the defense meant someone else had to have halee's cell phone. but the prosecution insisted isaiah had the phone all along. >> it looks like it powers back up at the soccer field, but we've since come to the theory that when you power your phone up, it hits on the last tower that it was on when it...

Defining moment for young halee. she was just 12 when she went to a friend's house for a sleepover. >> that night the brother of the girl that my daughter was staying with had a friend stay over, and he was 19. my daughter was 12. he tried to molest her. >> at first halee said nothing to her parents, but when she learned that the man preyed on other girls, the instinct to help led her to act in a way few her age would have the courage to. >> she testified and sent him to prison. after that i think that's when people knew that they could go to halee. she would stand up for the weak. the less fo...

Leaving that out is because you know i was scared. >> reporter: he insisted he'd left halee alive and well at the soccer field with her wallet and her phone. but investigators questioned that, too. their analysis showed halee's phone had been in the same location as isaiah's phone hours later when he was long gone from the soccer field. detective kruse pressed isaiah to explain, moving his chair closer. >> and that's why i need an explanation. >> reporter: isaiah's explanations kept changing. >> literally the only thing i can think of is it somehow got left in my car. i saw it. i saw it in the...