Nancy Guthrie Update: New Principle Emerges as Case Shifts

On, Sunday, March 1, the search for Nancy Guthrie, the mom of NBC "Today" show host Savannah Guthrie, officially entered its second month, and now, an expert is revealing a new principle in the case.

Nancy Guthrie went missing from her Tucson, Arizona, home on Feb. 1. One of the questions that has arisen from the investigation is what the suspect had in his pocket when he was spotted at her property.

Now, Tracy Walder, a former FBI agent and CIA officer, is giving her thoughts on what looks to be an antenna...