Who killed Jim Kendall in the Haircut?

In the short story "Haircut" by Ring Lardner, Jim Kendall is killed by a character named Joe, who is a local barber. The story is narrated by a character who recounts the events surrounding Kendall's death, revealing that Joe's actions stem from a long-standing grudge against Kendall. The narrative cleverly unfolds to expose the darker aspects of the seemingly mundane small-town life.