Photos: Remembering Martin Luther King Jr.

Aug. 28, 1963: The civil rights leader Martin Luther King waves to supporters on the Mall in Washington D.C. during the 'March on Washington.' King said the march was 'the greatest demonstration of freedom in the history of the United States. (Photo by AFP/Getty Images).

March 29, 1966: Civil rights leader Martin Luther King addresses the militants of the 'Movement for Peace' in Paris Sport Palace. Martin Luther King was assassinated on April 4, 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo by AFP/GettyImages).

March 29, 1966: Civil rights leader Martin Luther King addresses the militants of the 'Movement for Peace' in Paris Sport Palace. Martin Luther King was assassinated on April 4, 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo by AFP/GettyImages).

The shadow of a chain and stand are cast near the engraved granite plaque honoring Rev. Dr. Martin Luther King, Jr. on the steps of the Lincoln Memorial in Washington, D.C. where Dr. King gave his 'I have a Dream' speech. (Photo by Paul J. Richards/AFP/Getty Images).

Aug. 28, 1963: The civil rights leader Martin Luther King waves to supporters on the Mall in Washington D.C. during the 'March on Washington.' King said the march was 'the greatest demonstration of freedom in the history of the United States. (Photo by AFP/Getty Images).

Aug. 28, 1963: US civil rights leader Martin Luther King Jr. walks with supporters during the 'March on Washington' after which, King delivered the 'I Have a Dream' speech from the steps of the Lincoln Memorial. (Photo by AFP/Getty Images).

Aug. 28, 1963: More than 200,000 civil right supporters gather on the Mall in Washington D.C. during the 'March on Washington.' (Photo by AFP/Getty Images).