it all checked out as that local woman, nicole pietz, who had been missing for a week. the 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, david. and the information david pietz would soon share with detectives about when his wife was last seen and what she left behind 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 of nicole's car. >> when "dateline" continues. that's why a cutting edge university counts on centurylink to keep their global campus connected. and why a pro football team chose us to deliver fiber-enabled broadband to more than 65,000 fans. and why a leading car brand counts on us to keep their dealer network streamlined and nimble. businesses count on communication, and communication counts on centurylink. for over 100 years like kraft has,natural cheese you learn a lot about what people