Investigators are analyzing a new clue as they continue their desperate search for Today cohost Savannah Guthrie's mom, Nancy Guthrie. Surveillance footage from a Circle K in Arizona captured a "vehicle of interest," according to NBC News, and has been turned over to authorities. As Us Weekly previously reported, Nancy, 84 was last seen on January 31, just before 10 p.m., after having dinner at her daughter Anne and her husband Tommaso Cioni's house. Tommaso allegedly dropped his mother-in-law off at her Catalina Foothills home at 9:48 p.