DNA testing and new footage tips fuel search for Nancy Guthrie's disappearance

Authorities in Pima County continue probing the disappearance of Nancy Guthrie, the 84-year-old mother of NBC's Savannah Guthrie, after she vanished from her Tucson home. Investigators are analyzing biological evidence and a glove found near the property with DNA testing, while no evidence has emerged that she was abducted across the U.S.-Mexico border. Police are seeking Jan. 1–Feb. 2 doorbell footage and have not ruled out an accomplice; a lead involving a 'purchase' tied to Sonora has been ruled out.