August 17 - 1877: U.S. - teenager, "Billy the Kid," killed his first man as he wounded an Arizona blacksmith who died the next day. #history
— Today In History (@Yesterday_Today) August 17, 2020Do you want to know more? Per History.com:
In 1877, he was hired on as a teamster at the Camp Grant Army Post, where he attracted the enmity of a burly civilian blacksmith named Frank “Windy” Cahill. Perhaps because Billy was well liked by others in the camp, Cahill enjoyed demeaning the scrawny youngster. On this day in 1877, Cahill apparently went too far when he called Billy a “pimp.