Thousands of civil rights supporters gather outside a chapel in Selma, Ala., on March 21, 1965, the start of a five-day, fifty-mile march on the Alabama state Capitol at Montgomery. The march will be led by the Reverend Dr. Martin Luther King, who spoke at this church service preceding the march. Supporters of black voting rights will march from Selma to Montgomery to protest the killing of a demonstrator by a state trooper and to improve voter registration for blacks, who are discouraged to register.

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Martin Luther King, Jr., speaks at Soldier Field in Chicago in this undated photo.

PHOTO BY BERNIE KLEINA

Rev. Martin Luther King, Jr., is shown telling reporters he is “disenchanted” with President Johnson’s Vietnam policies and may end up endorsing either Sen. Robert Kennedy or Sen. Eugene McCarthy for the 1968 Democratic Presidential nomination in this undated file photo.

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In this March 1, 1965 file photo, Dr. Martin Luther King, Jr. and associates lead a procession following the casket of Jimmy Lee Jackson during a funeral service in Marion, Ala. In November 2010, former Alabama state trooper James Bonard Fowler pleaded guilty to second-degree manslaughter in the 1965 shooting of Jimmie Lee Jackson during a civil rights demonstration in Marion.

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ASSOCIATED PRESS Marchers stream across the Alabam

President John F. Kennedy meets with civil rights leaders in this undated photo.

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The statue of Dr. Martin Luther King, Jr. is seen unveiled from scaffolding during the soft opening of the Martin Luther King, Jr. Memorial in Washington, Monday, Aug. 22, 2011. The memorial will be dedicated Sunday, Aug. 28. The Washington Monument is at right.

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An unidentified guest arrives holding a document bearing the image of Martin Luther King Jr., ahead of President Barack Obama’s speech during the dedication of the Martin Luther King Jr. Memorial in Washington, Sunday, Oct. 16, 2011.

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Dr. Martin Luther King Jr. shakes his fist during a speech in Selma, Ala., Feb. 12, 1965. King was engaged in a battle with Sheriff Jim Clark over voting rights and voter registration in Selma.

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This photo released by the National Civil Rights Museum shows outside of the National Civil Rights Museum which is located at the Lorraine Motel is the assassination site of Dr. Martin Luther King, Jr. The museum chronicles key episodes of the American civil rights movement and the legacy of the movement.

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Dr. Martin Luther King, Jr., co-pastor with his father of Ebenezer Baptist Church in Atlanta, Ga., is shown as he speaks in Eutaw, Ala., June 4, 1965.

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An obscured speaker holds up a newspaper, objecting to the low estimate of march numbers reported by the press, while Martin Luther King stands nearby in this undated photo.

PHOTO BY BERNIE KLEINA

A visitor walks through the Martin Luther King, Jr. Memorial in Washington, Tuesday, Oct. 4, 2011.

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Marquette Park and an appearance of Martin Luther King, Jr. are featured in this undated photo.

PHOTO BY BERNIE KLEINA

Martin Luther King, Jr., raises his hand to the crowd while speaking at Soldier Field in this undated photo.

PHOTO BY BERNIE KLEINA

In this Jan. 18, 1964 file photo, U.S. President Lyndon B. Johnson, right, talks with civil rights leaders in his White House office in Washington, D.C. The black leaders, from left, are, Roy Wilkins, executive secretary of the National Association for the Advancement of Colored People (NAACP); James Farmer, national director of the Committee on Racial Equality; Dr. Martin Luther King Jr., head of the Southern Christian Leadership Conference; and Whitney Young, executive director of the Urban League.

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ASSOCIATED PRESS The Rev. Martin Luther King Jr.,

The Rev. Dr. Martin Luther King Jr. speaks April 15,1967 at a peace rally in New York City.

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ASSOCIATED PRESS Coretta Scott King and her daught

The Rev. Martin Luther King Jr. acknowledges the crowd at the Lincoln Memorial for his “I Have a Dream” speech during the March on Washington, D.C., on Aug. 28, 1963. The march was organized to support proposed civil rights legislation and end segregation. King founded the Southern Christian Leadership Conference in 1957, advocating nonviolent action against America’s racial inequality.

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Thousands of people take part in the Martin Luther King Jr. Day march in San Antonio, Monday, Jan. 17, 2011 in San Antonio.

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ASSOCIATED PRESS Coretta Scott King, widow of the

Marquette Park and an appearance of Martin Luther King, Jr. are featured in this undated photo.

PHOTO BY BERNIE KLEINA

ASSOCIATED PRESS Dr. Martin Luther King Jr., Ameri

ASSOCIATED PRESS Dr. Martin Luther King Jr. makes

In a May 8, 1963 file photo, civil rights leaders, Rev. Martin Luther King Jr., left, Rev. Fred Shuttlesworth, center, and Rev. Ralph Abernathy hold a news conference in Birmingham, Ala.

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Martin Luther King, Jr., participates in a Chicago march in the 1960s.

PHOTO BY BERNIE KLEINA