Article continues below advertisementInvestigators could be getting closer to solving the case of Today star Savannah Guthrie's missing mom, according to a former FBI agent. Speaking on the Tuesday, March 17, episode of "The Megyn Kelly Show," James Fitzgerald weighed in on Pima County Sheriff Chris Nanos' admission last week that police know the motive of Nancy Guthrie's alleged abductor."Those investigators know a lot more than we do," James told host Megyn Kelly and fellow ex-agent Maureen O'Connell.