Savannah Guthrie has shared a heartbreaking update more than 150 days after her 84-year-old mother, Nancy Guthrie, disappeared from her Arizona home. As investigators pursue new DNA and genetic genealogy leads, the FBI is also dealing with fake ransom notes sent during the investigation. A California man has now pleaded guilty to sending fraudulent messages that intensified the family's trauma. Here's everything we know about the latest developments, the ongoing search for Nancy Guthrie and Savannah's emotional plea to bring her mother home.