Tracy Martin, Trayvon Martin's father, spoke at a Capitol Hill forum on Wednesday, July 24, 2013. "There's nothing that we can do to bring Trayvon Martin back," Tracy Martin said in Washington. "But if there's something that we can do ... to help other families from going through this, then we're here." (Photo by POOL).
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Vowing to keep fighting for his son Trayvon -- even after the man who killed him, George Zimmerman, was acquitted of murder -- Tracy Martin said Wednesday that his family wants to turn "negative energy" surrounding their plight "into a positive."