January 07, 2007 Poisoned; First Lady; Dame Helen Russian spy and dissident Alexander Litvinenko poisoned and slowly dying, tells the world who did it. Bob Simon reports on a real life mystery that movies are made of. Plus: First Lady Betty Ford speaks with Lesley Stahl about her husband, President Gerald Ford, her own struggles with substance abuse and cancer. Also, Morley Safer with British actress Helen Mirren, the star of the controversial and powerful movie about the Queen of England.