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A parade of women took the stand. a woman ross had said he was in love with. another women he met at his home. >> we had sex. >> reporter: and a prostitute. >> did you actually engage in sexual acts with him back in may of -- >> yes, on three different occasions. >> reporter: this witness is one of the six women ross was communicating with the day he says he forgot about cooper. >> and at 5:46 a.m., within 17 seconds of your messages, did he respond? >> he did. >> reporter: did you have to consider the fact that maybe all these women were causing a distraction for ross, which then led to what ...

>> reporter: even prosecution witnesses wound up vouching for ross as a good dad. a teacher from cooper's day care. >> he would just spend quality time with him interacting with him doing the activities. >> reporter: and some of those women who testified for the prosecution about sexting with ross? even they agreed he seemed to love his kid. >> what would he say about his son? >> that he was great, and that he loved his son. >> he just talked about how much he loved him and how he would never do anything to hurt him and that kind of thing. >> reporter: but the woman who should have known ross ...

That ross had to have known that cooper was still in the backseat. that video of ross returning to the car. why would ross harris return to the scene of the crime? >> we know, first of all, doing this job enough, people do return to their scene of the crime. once he went into the car, he realized either this child was still alive or this child was dead and he couldn't take what he had done and he threw the light bulbs. >> reporter: and prosecutors dissected ross' behavior later that day. witnesses at the scene testified his reactions were off. >> did he ever ask to be with the child or ask to ...

The case became a media sensation with more revelations. investigators said ross had done internet research on hot car death and even visited an online forum for people interested in living a child-free life. a monstrous portrait was emerging. but even after weighing all the allegations, ross' friends were still convinced he never meant to hurt cooper. did you ever hear ross get frustrated with cooper? >> no. >> reporter: treat him like he was a burden at times? >> no. >> reporter: because you know there are times when kids can get on our nerves. >> no. no. there are times when you definitely ...

What you want. and i believe his answer back to me was, that's the last thing i want. >> reporter: prosecutors told us there was no evidence leanna knew what her husband was supposedly planning. and when they cross-examined know her husband at all. >> you'd agree there's a whole part of his life that you had no clue about? >> i would agree that i did not know the depth. >> have you read the text messages that he sent to these other women? >> no. i have no -- i have no reason to have read them. >> okay. so if he's saying foul things to a 15-year-old girl, you wouldn't think that that was someth...