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Been on where i heard jury members snicker. >> reporter: but the crawleys, who were in court when those tapes were played, were not laughing. they say they'd heard many of those calls firsthand and believed they were the real thing. the jury had heard jermeir testify. he has a deep voice. and the person on the tapes doesn't have a deep voice. >> doesn't have, exactly. he disguised his voice. >> reporter: you think he can disguise his voice that well? >> yeah. >> apparently, he can. >> well, he did it. he did it. >> reporter: you're convinced that was jermeir. >> oh, it was jermeir. >> reporter...

That shannon crawley and her family insisted were jermeir stroud copping to the crime and trying to cover it up. >> i got away with it once. i'll get away with it again. just keep your [ bleep ] mouth shut. >> this is wrong. i didn't do anything. >> you know i'll find you. >> reporter: police were not present when shannon recorded the calls, but they were able to trace where they originated from, a payphone, so there was no way to confirm jermeir had made them. assistant d.a. david saacks listened carefully to the tapes and soon came to his own conclusion. is there any way that could be jermei...

Situation across the street. can you please watch the kids." >> reporter: murder investigations are of course based on more than just witness statements. the csi team rushed over to todd and rachel's house and assistant d.a., lisette suder, joined them as they searched and documented the interior of a house that was strangely chaotic. >> reporter: what did it look like? >> the house is well-manicured. minus the fact that there's this yellow crime scene tape up. and then you walk through that and you walk into the doors and the house is in complete disarray. kitchen is completely undone. basebo...

He said she did it. she was saying he did it. shannon had been charged with murdering smith and that's when she shared a new version of events claiming he was the real killer. authorities were intrigued but skeptical. shannon captured a series of recordings that she was sure proved her innocence. what would investigators make of this tale of the tape? it is rare for women to murder. more often they convince their men to do it for them, a kind of homicidal honey-do list. that was exactly what investigators were debating in june 2007. it had been six months since denita smith's murder. and sit...

>> well, we learned that they had conducted surveillance at ashlea's apartment weeks before that. they had a picture of her apartment. her actual door to her apartment, and they had pictures of her vehicle, the white dodge ram pickup. >> reporter: in early december, 2014, carter cervantez and david mallory were arrested and charged with the murder of ashlea harris. cold comfort for ashlea's sister. >> it's just such a loss and it's so pointless. i just don't understand how people could do that. >> reporter: they were tried separately, but the cases against them were virtually identical. assist...