Katie Couric mourns her mother: "My heart is broken"

Former TODAY anchor Katie Couric is mourning the loss of her mother, Elinor H. Couric, who passed away Thursday at the age of 91.The 57-year-old journalist, who co-anchored TODAY for 15 years and now works as a Yahoo News Global Anchor, expressed her sadness Thursday morning across mutliple social-media platforms.”My heart is broken,” she wrote on Twitter. “I lost my mom and best friend.