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>> 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 couldnt 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 hold the child or anything like that? >> no, sir, not that i recol...

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 couldnt 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 ...

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 couldnt take what he had done and he threw the light bulbs. >> reporter: and prosecutors dissected ross behavior later that day. witnesses...

Prosecution showed what it believed was powerful evidence 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 couldnt take what he had done and he threw the light bulbs. >> reporter: and pro...