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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...

Evidence against brad? ironic, perhaps, given the defendant's particular expertise. >> we knew we had this fabricated alibi we needed to address. >> reporter: the issue was the phone call the morning nancy disappeared, brad's cell phone registered a call from home at 6:40 a.m. when he went back to the store. proof, surely, that nancy was alive at 6:40, unless, that is, unless brad placed the call himself. brad, the world-class expert in internet phone technology. >> if anyone could do that, it was the defendant. ultimately, he had the potential to make that phone call. >> in testimony that was...

>> 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...

>> if anyone could do that, it was the defendant. ultimately, he had the potential to make that phone call. >> reporter: in testimony that was, frankly, mind numbing. >> that leverage is something called either tappy or j tappy. >> reporter: an expert from cisco, brad's former company, explained about ten different ways someone as accomplished as brad could have remotely made 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 phone call can be made from your computer from the computer's modem. >> reporter: to do t...