His wife, Amelia Montgomery, said he died of natural causes Saturday morning at a Manhattan hospice care facility. He had lived in Harlem until he entered the facility Aug. 25.
Montgomery was born in in Selma, Alabama, in 1923 and was inducted into the armed forces in 1943. He served as a ground crewman with the Tuskegee Airmen in southern Italy during the war.
He attended Livingstone College in North Carolina on the GI bill and later moved to New York to find work.
Montgomery was active in the civil rights movement, serving as a bodyguard to King during the famous 1965 Selma to Montgomery march.
Amelia Montgomery said the heels of the shoes and the tie her husband wore on the Selma march will be part of the permanent collection at the new National Museum of African American History and Culture in Washington, D.C. , when it opens on Sept. 24.
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