The FBI has arrested what an official called a "total imposter" for allegedly trying to profit off the mysterious disappearance of "Today" show host Savannah Guthrie's mother with a bogus ransom note. FBI Phoenix's special agent in charge, Heith Janke, said at a press conference over the disappearance of 84-year-old Nancy Guthrie that the arrest was related to an "imposter ransom demand" for the woman, who authorities believe was taken from her Arizona home five days ago. Additional details