Byron De La Beckwith. Jr., a white supremacist, using an Enfield .30-06 caliber rifle, assassinates Medgar W. Evers, mississippi Field Secretary of the National Association for the Advancement of Colored People.
NOTE: Evers was initially refused admission at the local hospital because of his race.
[added 10/7/2022]
Subsequent Events:
References:
Medgar Evers – Wikipedia
en.wikipedia.org/wiki/Medgar_Evers#Activism
Byron De La Beckwith – Wikipedia
en.wikipedia.org/wiki/Byron_De_La_Beckwith#Assassination_of_Medgar_Evers