On this day, April 23, in 1963, a postal worker from Baltimore and former U.S. Marine was shot and killed in Alabama during a one-man march to deliver a letter to the Mississippi governor urging the end of racial segregation.

William Lewis Moore, who was white, wore a sandwich board saying "Turn toward Peace." About 80 miles into his trip, he was shot twice in the head with a .22-caliber rifle.

Moore's letter said, "The white man cannot be truly free himself until all men have their rights." Two men were arrested, but no one was ever convicted in Moore's slaying.

The FBI announced in 2009 that Moore's was one of more than 100 civil rights-era cold cases that have been reopened.

- Scott McCabe