According to the Chicago Sun-Times, a credible lead has led police to begin searching for the body of Stacy Peterson, who disappeared in 2007. Peterson's husband, Drew, was arrested last year for the murder of his third wife. [SunTimes]
At first I thought there was a typo and that you meant Laci Peterson, and then I remembered that her body had been found and that I had read about this case before. It's so terribly depressing that women disappear and are killed at the hands of their husbands (allegedly?) so frequently that I could easily think of and get confused between two different cases.