Photographer and student Richard Copley, bottom right, covered Martin Luther King Jr.'s speech to an overflow crowd at the Mason Temple, March 18, 1968, in Memphis, Tenn.

Martin Luther King Jr.'s assassination and lasting legacy in Memphis Martin Luther King Jr. is famous for his work during the Civil Rights Movement in the 1950s and 1960s.

Coretta Scott King, wife of Dr. Martin Luther King Jr., leads a silent memorial march in her husband's memory, April 8, 1968, following his assassination in Memphis, Tenn.

The Trump administration has released more than 200,000 documents related to the 1968 assassination of civil rights leader Martin Luther King Jr. King was fatally shot in Memphis, Tennessee.

Martin Luther King Jr., head of the Southern Christian Leadership Conference, left, speaks to thousands during his ″I Have a Dream″ speech at the Lincoln Memorial during the March on ...

Endless leads Charles Q. Stephens looks across the street to the Lorraine Motel, April 9, 1968, where flowers mark the spot that Martin Luther King Jr. was assassinated in Memphis, Tenn.

The Rev. Martin Luther King Jr. speaks on the telephone after encountering a white mob protesting against the Freedom Riders in Montgomery, Ala., on May 26, 1961.