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Old seat for reasons not known. cooper was several inches too big for the rear-facing seat. why is this important to investigators? >> this may be planned. even though they knew he should be in a forward-facing seat, they intentionally kept him in a rear-facing seat. there are many reasons, in fact, if they wanted to hurt their son. he would be facing the son the way the car was laid out, if he was facing the back window. additionally put on the highest strap, designated for a new born. which would show they were really trying to resfritrict hi ability to move and help himself. which makes thi...

Sexting issues, then it probably wasn't a motive for murder. if she didn't know, it might have been. so prosecutors need to find a between the sexting and the murder. >> let me put it this way, nbc found the profile that appears to belong to harris. he wrote, quote, i'm now in my dream job. i have a beautiful 6-month-old son, and love going to work everyday. i couldn't be happier. now these postings stopped on june 18th. the day cooper died in the hot suv and harris was taken into police custody. so we see two different personalities reflected here? >> yes, we are. >> there we good. sorry. i s...

Ross harris is now charged with his son, cooper's, murder. here's what authorities were trying to find out. how hot did it get inside that vehicle that day. because we know the temperature topped 92 degrees on the day cooper died. and how long might it have taken for cooper to die? how long did that little baby suffer? victor blackwell joined me live from the cnn center now in atlanta. so many questions about this. all the while, as the investigators and the d.a. are trying to mount their case against justin harris, all sorts of online activity is starting to emerge about what he was up to in ...

Reaction to this unspeakable tragedy. this woman is part of the investigation. she is not under investigation. why are so many legal pundits and everyone else so interested in her right now? >> i think a lot of it has to do with evidence that would not hold up in a court of law, but certainly counts for a lot in the court of public opinion. people will point to the fact whether it was with the revelations that police made about her husband's alternate life, and also about the death of her child, she has never shown any emotion. then on top of that, people wonder, look, she is so close to this ...

The most common term would be sexting. >> reporter: stunning claims of raunchy text messages, suspicious internet searches, and a plan to kill his son. >> evidence is showing us right now that he's got this whole second life that he's living with alternate personalities and alternate personas. >> reporter: harris sat shackled and sullen as detective phil stoddard detailed x-rated messages allegedly exchanged the day cooper died, including with a then 16-year-old girl. >> were photos being sent back and forth between these women and the defendant during this day when the hild child's out in the...