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>> detective sanchez claimed by leaving her in the water, it watched any a mint. >> i thought that she was gonna be dead in the water. >> we started looking for what happened. there was still water in the drug. we pulled the train and i saw blacks got marks. >> a case that would see the suspect leave town. and >> unearthed dark deeds from the past. >> she would wake up and he was be standing over her. >> that's creepy. >> sinister stories! >> she told me that he was following her. >> yet justice was anything but certain. >> you want that smoking gun. >> uh-huh. >> and there's just no...

Polygraph. >> did you inflicted injuries to the flow come on march 24th? >> no. >> the results were inconclusive. not so good for billy and that alibi? it just kind of sat there unchecked. until, finally, a year later, lieutenant did some checking in confirm that billy's alibi was absolutely solid. the, when we tracked him down, he said, this. >> they never did, in my mind, -- never really, truly suspected me, because i had such an alibi. >> i hate to say it, but i've looked at what they were saying, you were their number one person of interest. . at least, one investigators person of interest...

Close? billy told the detective he had an alibi. he and a buddy were out in the country working on his cabin. >> we were working on that roof and when i got the call, we'd been out there for a couple of days. >> but, of course, as any detective could tell you people lie all the time about alibis. sanchez asked billy to take a polygraph. >> did you inflict any injuries to the victim on march 24th? >> no. >> the results were inconclusive? not so good for billy and that alibi? it just kind of sat there unchecked. until finally a year later lieutenant tavizon did some checking and confirmed his al...