Boulder Dam

"Rusty" Noonan, a hard-boiled, cynical, selfish smart-aleck, working as a mechanic in a Detroit garage, is outraged when he has to work overtime on repairing the shoddy work he had done on a taxicab, gets into an argument with the shop-foreman, Wison. The foreman takes a swing at him and misses but Noonan, a trained boxer connects with his punch. The blow catches Wilson on the chin, knocks him off his feet and his head hits the floor and he is killed. (imdb)