it all checked out as that local woman nicole pietz, who had been missing for a week. diamond tennis bracelet she always wore was not on her wrist. but police were confident enough in their tentative i.d. to pay a visit to nicole's husband, dave. and the information david pietz would soon share with detectives about when his wife was last seen and what she left behind was would be critical to the case. >> coming up. but it was something that was missing that turned out to be even more important and puzzling. >> there's no indication that anyone else had been behind the wheel. >> when dateline returns. this past year has felt like a long, long norwegian winter. but eventually, with spring comes rebirth. everything begins anew. and many of us realize a fundamental human need to connect with other like-minded people. welcome back to the world. viking. exploring the world in comfort... once again. ♪ ♪ look, if your wireless carrier was a guy you'd leave him tomorrow. not very flexible. not great at saving. you deserve better... xfinity mobile. now they have unlimited for ju