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I'm craig melvin. investigators probing the hot car death of cooper harris discovered video evidence they say proved his father ross would have known that cooper was still in the car and now secrets about ross' personal life were about to be revealed. surprising details that could provide a glimpse into a possible motive for murder. here again is andrea king. >> reporter: police were suspicious of ross harris from the moment they met him on that first terrible day. but their next discovery would turn this strange case into an explosive one. police seized his phone and computers. and that's whe...

Sexual chats happened on the very day cooper died. he was communicating with a woman -- >> right. >> reporter: -- ten minutes before he left with cooper? >> right. we were able to determine that he had been messaging at least six different women throughout that day, sending pictures of himself, asking for photographs. >> reporter: prosecutors believed ross harris was in the grip of an escalating obsession with sex. and they came to an awful conclusion. that ross wanted so badly to be rid of the constraints of family and fatherhood, he decided to kill his own child. does being a creep with wome...

Convicted of an unthinkable crime, murdering his 22-month-old son cooper leaving him to die in a sweltering suv on purpose. >> anybody who could do this, and the evidence showed that he did this intentionally, he has malice if his heart. >> reporter: the case had riveted the nation. in june of 2014, harris told police he'd forgot to know drop off his son at day care and drove straight to work, not realizing cooper was strapped in his car seat for seven hours. harris' reaction caught on dash cam when police arrived. >> oh my god! what have i done? >> reporter: in a trial filled with dramatic te...

Message with alarming new meaning. meanwhile, in a suburban atlanta parking lot, it was disturbing deja vu. in this footage recorded by waga, investigators scientifically reenact the conditions that led to 22-month-old cooper harris' death using the same silver suv, the same child seat in which the toddler died parked in the same space outside justin harris's office. detectives could be seen wiring up instruments inside the vehicle and taking readings outside, seemingly coinciding with key moments in the case. the dad maintains he forgot to drop his son off at day care that day, june 18th, ins...

Detectives could be seen wiring up immanents inside the vehicle and taking readings outside, seemingly coinciding with key moments in the case. the dad maintains he forgot to drop his child off on june 18th, instead leaving him strapped in the car seat for about seven hours before discovering his lifeless body. meteorologist chad myers says weather wise the day cooper died matched almost exactly. >> cloud cover, big puffy cumulous clouds going, yesterday and june 18th are as close as you can get. >> reporter: using their own measurements, cnn's experts say the interior of the car where cooper ...