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Came over me. i didn't know what to feel or at that moment. i really didn't know. >> we want to make sure that he knows details about the crime and the things he's telling us match up with what we already know about the crime scene. want to make lure it's information that hasn't been released to the media. >> although eric koppel confessed, he wouldn't tell police why he did it. >> he always claimed he didn't know what he did with the murder weapon, which, again, to me always suggested to me that he wasn't telling the truth, because it seemed to me that that would be something he'd be able to ...

>> koppel was arrested and charged with two counts of first degree murder. investigators learned that koppel blamed adrienne for the breakup of his engage. to lily. >> it appeared that some people and possibly adrienne were telling lily that she could do better and that she shouldn't be any longer involved in this relationship with eric koppel, that he wasn't good enough for her or right for her. >> on the night of the murders, koppel went to a halloween party and ran into his ex-fiance, lily. according to witnesses, the two argued. koppel wanted to set a new date for their wedding, but lily w...

>> were it not for a few drops of blood, two cigarette butts and some skin cells on a rubber band, eric koppel might have gotten away with murder. but ever advancing dna technology provided a profile so accurate it was only a matter of time before he was exposed as the killer. >> this case turned on those cigarette butts. >> things that would have not been considered 20 years ago as evidence are very crucial to cases nowadays. and again, the sensitivity of these testing analysis, dna, it's just incredible what we can find in crime scenes now. >> every homicide that you see, there's always a tw...

Blondish hair and most likely has green eyes. >> he now knew two things, that he made too many mistakes and the dna technology had advanced far beyond anything he could have ever imagined. the same time police asked the surviving roommate if she knew any one who smoked this brand of cigarettes. >> she'd let us know, well, the only smoker i can think of at this point is eric koppel. >> 25 year old eric koppel was a land surveyor and a friend of one of the victims. but before police could question him, koppel walked into police headquarters and confessed. >> i'm just getting done with dinner, an...

Have come into our radar sooner, but again, we can always look back and wish we had done things differently. >> a few months before he confessed, eric koppel patched things up with lily and the two married. in a bitter irony, the couple asked arlene allen, adrienne's mother, to be part of the wedding with ceremony. lily claims she never suspected eric was the killer. in december of 2006, eric koppel pleaded guilty to two counts of first degree murder. he was sentenced to life in prison without parole. had he not pled guilty, koppel would have been eligible for the death penalty. >> and i think...