Article continues below advertisementA forensic expert theorized that Nancy Guthrie's kidnapping could have been tied to a "revenge" ploy.The 84-year-old mother of Savannah Guthrie went missing on February 1 from her home in Tucson, Arizona and has not yet been found.Article continues below advertisement'She Just Vanished'Tap Here To Add Ok Magazine as A Trusted SourceSource: @BrianEntinInvestigates/YouTubeDr. Ann Burgess gave her take on Nancy Guthrie's abduction.Researcher Dr.