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>> reporter: all of that is so counter intuitive and so bizarre that, you know, you wouldn't be expected to believe such a thing. >> no. >> reporter: it was stunning. really. liz apparently impersonating cari for years sending thousands of texts and emails in her name. but now they had a bigger question and a much bigger problem. >> i guess part of the worry was that if-- even if we could prove that it's liz sending all this stuff out as cari, well, that doesn't prove murder. >> reporter: murder? yes. sgt. doty and cpl. avis believed that liz killed cari out of jealousy, impersonated cari in o...

Dave kroupa. >> she did it, because she wanted this man. >> reporter: jealousy makes people do strange things, but that's just -- why so much? what -- why? >> i think it snowballed. i think once she did it she couldn't stop. she had to make cari look like she was still alive to keep the heat off of her, and it just went on, and on, and on for years. dave kroupa heard it all, and finally understood. >> i mean, it makes sense now, at the end. you know? but the tarantino movie always makes sense at the end. you know, it doesn't make any sense getting there. >> reporter: and liz's defense attorney...

>> the car was broken into, and i was kind of worried that -- since she had a key to his apartment. >> and that's when liz realize tchltd the deadly fire that killed her pants. ly that skoer, the company, dave's. die bol cal. think about it t though, she was the one who held the noefb. cari? >> yeah. >> i understand where things will be in two weeks. >> and she -- supposedly sl.

Tony kava went back to dave kroupa again, and asked if he had anything that might help them, and that's when it hit him. he'd put a tablet into storage, had forgotten all about it. so he fished it out and kava examined it. >> tony removed the external sd card, the memory. >> reporter: ah, yeah? >> and had been deleted and reformatted. >> reporter: blank, or so it seemed, until kava took a closer look, pay dirt. >> there were, i want to say thousands of pictures that he was able to locate. >> reporter: thousands of photos that liz thought she had deleted. >> one of the pictures we found, it was...

And on the other side? hard to believe. >> reporter: coming up -- >> why else would you disguise yourself as cari if you weren't responsible for it? >> reporter: what had really happened to cari? police hatch a bold new plan to finally get to the bottom of it all. >> i'm investigator doty, i work here for the sheriff's office. >> reporter: when dateline continues.