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I had my dogs leashed and next to me, just sitting there, ready. god forbid he comes through that door, i'm ready. >> reporter: derek never showed, so dorie fled to her brother's ranch. >> and while i was out there, i started digging into my finances. >> reporter: dorie searched her accounts and there it was, derek had drained her checking account and charged thousands on one of her credit cards. >> in total $19,800. the only thing i can put together is i went upstairs. you know, he snapped a picture of my checkbook and then this extra credit card that i had up there, he took. >> reporter: she...

Really good about himself. >> like a princess. >> yeah. made me feel really good. >> reporter: but she says richie the romantic also had a dark side. >> he would just, you know, whether it be kick the wall, kick my bookcase, kick something. flip something off the coffee table, but i always made excuses for it. >> reporter: the dramatic end came the day richie left behind an ipad he had borrowed from dorie. >> i pick it up. i flip it open and everything's different on the front page. >> reporter: he's hijacked your ipad? >> yeah. >> reporter: and what do you find inside? >> a picture of him lay...

In and he did a photo lineup. picked him out immediately. so that was for me an airtight case. we could go ahead and get a warrant and get him into custody before he ran. >> reporter: but there was something else she needed to do. of all the stuff he'd left behind at dorie's, one thing stood out. >> he also had a badge from the ncis, naval criminal investigations. it looked to me like a legitimate badge. >> reporter: so she reached out to ncis and showed that badge to a real agent. when he compared his to derek's, he couldn't tell them apart. >> he took pictures of it. he goes, "i have to send...

>> reporter: during the game, dorie says richie's phone buzzed an urgent call from the pentagon. he told her they were asking for his expertise on north korea. >> the north korean crisis started right around that time. there was a senate hearing committee that he was gonna have to go down and present his opinion. >> reporter: are you thinking, "wow, this guy's really high level?" >> yes. i was impressed. >> reporter: later on, she saw his uniforms, those medals, all kinds of military awards. >> reporter: did he ever wear his military uniform around you? >> he did put on his dress blues when he...

Assured dorie she would make sure he didn't get away this time, unlike many detectives before her, she understood this wasn't about scorned women out for revenge. >> i took it probably a little more personal than other cases i would have, just because, you know, you could see the trail that he left of just destruction. >> reporter: and here's where dorie did something that would prove crucial to the case. >> we've gotta stop him. we've got to do something different that hasn't worked before. >> reporter: after derek left, she collected a closet full of potential evidence. >> i had all kinds of...