New details have emerged in the disappearance of 84-year-old Nancy Guthrie, mother of Today show co-host Savannah Guthrie, with a sergeant from the Pima County Sheriff's Department saying that the family initially believed the missing matriarch might have simply "walked away" from her Tucson-area home before investigators concluded the case likely involved an abduction. The remarks, released more than three months after Nancy vanished on January 31, appear to conflict with earlier public statements from both the family and law enforcement stressing that she would not have left on her own.