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Amputee searches for hero who saved her at Boston Marathon

Erika Brannock, a survivor of the Boston bombings, is in search of the woman she remembers named Joan who tended to her in the aftermath of the blasts. In an interview with Rock Center Anchor Brian Williams, Brannock describes the woman who helped save her and expresses her desire to thank her. If you know anything about the woman who Brannock says helped her, tweet us at @RockCenterNBC or message us on Facebook.