A new demand letter emailed to TMZ claims to have evidence linking two people to Nancy Guthrie's February kidnapping. The letter reportedly references a phone containing photos, names and a video of the alleged "main guy" with the 84-year-old mother of journalist Savannah Guthrie. Authorities continue investigating the case nearly five months later as Nancy's whereabouts remain unknown. #nancyguthrie #savannahguthrie #crime