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>> and this is dateline. >> this doesn't happen in our happy little world. >> their world shattered, a young mother strangled. >> we had a homicide and no >>lso no evidence. but police found a dark side behind that bright suburban facade. >> she slept with the children and the door locked. >> and finally a vital clue. what happened to nancy the day she disappeared? welcome to dateline. a young mother disappeared one her husband said she went for a run and never came home. the puzzling case happened in a safe, suburban neighborhood where crime is unexpected. but sometimes there are se...

>> also no evidence. but police found a dark side behind that bright suburban facade. >> she slept with the children and the door locked. >> and finally a vital clue. what happened to nancy the day she disappeared? welcome to dateline. a young mother disappeared one her husband said she went for a run and never came home. the puzzling case happened in a safe, suburban neighborhood where crime is unexpected. but sometimes there are secrets hidden behind closed. >> it all seemed like such a bad -- >>. >> it. . at >> reporter: it was a saturday morning in july. the happy little world su...

Using a computer where you can program something into your computer and delay it so that a phone call can be made from your computer from the computer's modem. >> to do that, brad needed a certain router. one prosecutor said conveniently disappeared from the cooper home. >> we know he had this router. >> in fact, said the prosecution, this cisco chat log proves brad borrowed that router, the 3825 it's called, took it home, months before the murder. >> you know that defendant had one of those two 3825 routers? >> that's correct. i only had two. >> and you never got that 3825 router back? >> no,...

>> that's right. >> somebody else put it on his >> reporter: in testimony that computer? >> yes. was, frankly, mind numbing. >> an fbi agent had testified >> that leverage is something called either tappy or j tappy. >> reporter: an expert from that he saw no evidence of tampering, but the defense said, cisco, brad's former company, it had experts who did. explained about ten different ways someone as accomplished as brad could have remotely made two of them. that call. >> the main ways to do it are using a computer where you can program something into your computer and delay it so that a both...

Took it home, months before the murder. >> you know the defendant had one of those 3825 routers? >> that's correct. >> and you never got that 3825 router back? >> no. >> cisco doesn't have it back. where did it go? it was never returned. >> but it was brad's own computer examined by the fbi which coughed up the most accusing evidence of all. evidence he'd already lied under oath. >> the kids fell asleep around 9:00 p.m. i fell asleep soon after. >> brad said he was asleep with his daughters when nancy came home from that party friday night. but brad's computer said otherwise. he was online unt...