[Warning: Potentially Triggering Content] As the search continues for Nancy Guthrie, the 84-year-old mother of TODAY show co-host Savannah Guthrie, federal authorities say a California man decided to insert himself into the family's nightmare in a truly disturbing way. According to a criminal complaint filed Thursday in Arizona federal court, a man named Derrick Callella, believed to be in his mid-forties, has been arrested and charged for allegedly sending fake ransom messages to members of the Guthrie family.