Nancy Guthrie ransom notes sent by one person, says former FBI profiler NewsNation‘Tell Us Where to Look,’ Savannah Guthrie Pleads 6 Months Into Search The New York TimesSheriff hopeful disappearance of Savannah Guthrie’s mother will be resolved WRALSheriff in Nancy Guthrie Abduction Still ‘Positive’ They Will ‘Resolve’ the Case People.com'Do the right thing': Savannah Guthrie pleads to mother's kidnappers BBC