What is jimmy doyle?

Jimmy Doyle is a fictional character from the short story "The Killers" by Ernest Hemingway. He is a professional hitman who, along with his partner Al, comes to a small town looking for a man named Ole Andreson. They plan to kill him, but when they discover he is not at the diner where they were told he would be, they leave without carrying out the hit. Doyle is shown to be ruthless and indifferent to the consequences of his actions, making him a classic example of a noir antagonist.