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 suburb of raleigh, north carolina, called cary, a place where a young family would aspire to if you were someone like hanna pritchard, for example. there s always lots of friend making going on through someone you meet. lots of cookouts and family functions. reporter: like the one in the neighborhood the night before. so hanna would have heard party stories that saturday morning from her friend nancy co
. at reporter: it was a saturday morning in july. the happy little world suburb of raleigh, north carolina, called cary, a place where a young family would aspire to if you were someone like hanna pritchard, for example. there s always lots of friend making going on through someone you meet. lots of cookouts and family functions. reporter: like the one in the neighborhood the night before. so hanna would have heard party stories that saturday morning from her friend nancy cooper. would. i hadn t heard from her maybe by like 10:00, i called her house. brad answered and he said, she went for a run. reporter: nancy was an athlete, training for a half marathon. brad cooper was nancy s husband. i was like oh, okay. when did she leave. he told me 6:30 or,,? it reporter: weird. if nancy had to cancel their meeting,