. >> when dave pietz showed up at the friends apartment that evening, nikki wasn't there. ur, two hours, and still no nikki. dave's wife of almost four years was gone into the night, into the rain. what on earth had happened to nikki pietz? >> turns out, nikki had a troubled past. had those troubles finally caught up with her? or was it something else? coming up -- >> did you think something was wrong, something more was wrong from the beginning. >> yes. >> when dateline continues. >> nicole pietz, a woman just shy of her 33rd birthday, reported missing by her husband. >> we just want to know she's safe. >> david pietz told reporters how he waited with her with friends at a saturday night dinner party. she was a no-show. >> she was not there. they haven't heard from her. they haven't been able to contact her. >> david appeal to the public to keep an eye out for her. >> we want them to know we love her very much. >> nicki's mom was by his side. >> she's not somebody who wouldn't come home. she somebody that, if she's ten minutes late, she would call. >> did you think somethi