“Dateline” is taking a look at the disappearance of Nancy Guthrie, the mother of NBC’s Today co-anchor Savannah Guthrie. Nancy Guthrie disappeared more than a month prior to the airdate of the special ...

“Dateline” is taking a look at the murder of Sue Marcum, a professor who at first appeared to have been killed in the midst of a burglary gone wrong. The truth may have been even more sinister. The ...