The FBI announced Wednesday it will exhume the body of Emmett Till in an attempt to determine who killed him nearly 50 years ago. The murder of the 14-year-old African-American boy shocked the nation and helped fuel the civil rights movement. Till was pulled from his bed in Mississippi and brutally killed, allegedly for whistling to a white store clerk. Two white men implicated by eyewitnesses were acquitted by an all-white jury. New evidence in the case emerged during the production of a recent PBS documentary implicating many others in the murder.