Tibbs tells Purdy to check Delores' purse for the money Ralph gave her for an abortion, which he got from killing and robbing Colbert. Purdy realizes Tibbs is right when he examines the purse. After Purdy confronts him for getting his sister pregnant, Ralph shoots Purdy dead. Tibbs grabs Ralph's gun as Gillespie arrives on the scene. Ralph is arrested and confesses to Colbert's murder. After hitchhiking a ride with Colbert and asking him for a job, Ralph attacked him at the construction site of the new factory. Ralph only meant to rob Colbert but unintentionally killed him.