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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...

Her husband said she went for a run and never came home. it was a puzzling case. it happened in a safe suburban neighborhood, the kind of place where crime is unexpected. even more unexpected the tiny clue buried in a computer that unlocked the mystery. here's keith morrison. >> reporter: nothing about that morning made any sense. >> it all seemed like such a bad nightmare. this doesn't happen in our happy little world. >> reporter: it was a saturday morning in july. the happy little world suburb of raleigh, north carolina, called carey, a place where a young family would aspire to if you were...

Hello and welcome to "dateline extra." i'm craig mellin. this story involves a young mother who disappeared one morning. her husband said she went for a run and never came home. it was a puzzling case. it happened in a safe suburban neighborhood, the kind of place where crime is unexpected. even more unexpected, the tiny clue buried in a computer that unlocked a mystery. here's keith morrison. >> nothing about that morning made any sense. >> it all seemed like such a bad nightmare. this doesn't happen in our happy little world. >> it was a saturday morning in july 2008. the happy little world ...

For example. >> always lots of friend making and family functions. >> so hannah would have heard party stories that saturday morning from her friend nancy cooper would have, because nancy didn't show up. >> i hadn't heard from her maybe by like 10:00, i called her house, brad answered and he said, oh, she went for a run. >> nancy was an athlete, had been training for a half marathon, brad cooper was nancy's husband. >> oh, okay. when did she leave and she told me i don't know, 6:30 or 7:00. oh, she's not back? >> weird. if nancy had to cancel their meeting surely she would have called. hannah ...