Article continues below advertisementNancy Guthrie, the mother of TV host Savannah Guthrie, has been missing for days, prompting a frantic search. According to Tracy Walder, a former CIA officer and FBI special agent, Nancy was likely "stalked for some time" before her kidnapping.Article continues below advertisementSource: COURT TV/YouTubeExperts believe Nancy Guthrie may have been stalked before her disappearance.