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
that s where people wanted to be. reporter: she and brad were like a lot of people in cary, raising a family here, having got their start in another place and,,,, that s where they met back in 98. i really liked her. reporter: as did nancy s younger sister jill. it s someone who is warm, genuinely saw how much he cared for her. reporter: brad became a helpful member of the family, even designed the computer systems in the family business. our i.t. guy would say i want to meet the guy who did this, the networking system. he was kind of a legend in the i.t. world. reporter: he was so good, that cisco systems invited him to move to raleigh and work for the. smart guy? smart guy. yes. ,. if nancy was to go with him to america, for immigration reasons, they had to be married. so in the fall of 2000, they said their vows, an intimate family affair. how did she feel about going