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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 thats when they found the photos and texts. >> this guy clearly was leading a double life. >> reporter: investigators found a sordid stash of sexually explicit online chats and texts between ross and a number of women, one as young as 15. and whats more, some of the sexual chats happened on the very day cooper...

Investigators probing the hot car death of cooper harris discovered video evidence they say proved his father ross would have known cooper was still in the car. now secrets about rosss personal life were about to be revealed. surprising details that could provide a glimpse into a possible motive for murder. here again is andrea canning. >> 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 e...

And whats more, some of the sexual chats happened on the very day cooper died. >> he was communicating with a woman ten minutes before he left with cooper? >> right. and 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. >> 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 const...

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 thats when they found the photos and texts. >> this guy clearly was leading a double life. >> reporter: investigators found a sordid stash of sexually explicit online chats and texts between ross and a number of women, one as young as 15. and whats more, some of the sexual chats happened on the very day cooper...

Sexual chats happened on the very day cooper died. >> he was communicating with a woman ten minutes before he left with cooper? >> right. and 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. >> 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 fatherh...

Im 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 t...

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 ...

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 hed 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 wh...

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 harriss office. detectives could be seen wiring up instruments inside the vehicle and taking readings outside, seemingly coinciding with key moments...

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...