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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...

>> reporter: nancy began locking important papers including the girl's passports in her car. >> i went down in february '08 it was awful. i had never seen nancy stressed out before. i never seen her raise her voice in the house. she was just miserable. >> reporter: miserable. stressed. each day uncertain, a painful struggle, an angry contest. >> she said, this is just, i think, a game to show me how difficult it's going to be. it's his attempt to force me back into this relationship. >> reporter: then, as nancy was preparing to move back to canada and with brad's blessing to take the girls, on...

Papers, including the girls' passports in her car. >> in february of '08, and it was awful. i had never seen nancy stressed out before. i had never seen her raise her voice in the house, and she was just miserable. >> miserable, stressed. each day uncertain. a painful struggle. an angry contest. >> she said this is just, i think, a game to show me how difficult it's going to be. it's his attempt to force me back into this relationship. >> then, as nancy was preparing to move back to canada and with brad's blessing take the girls, one of those moments on which lives can turn. the arrival from n...

Her access to the bank accounts, put her on a cash allowance. >> i recall a time she was in the car with me and she called him and said i've got $2 and we don't have any diapers. >> nancy couldn't get a job. she had no green card. she began painting a friend's house to earn some extra money. when she did, brad reduced her allowance. she must have been furious at him. >> furious would be on understatement. >> she's very proud and she'd feel guilty. i'm not going to take your money. no, this isn't your job to support me and my kids. >> nancy began locking important papers, including the girls' p...