Hank was killed by his brother Andy.
In the film “Before the Devil Knows You’re Dead,” Hank Hanson, played by Ethan Hawke, finds himself in a dire situation after a robbery he and his brother Andy, portrayed by Philip Seymour Hoffman, commit goes terribly wrong. The plan was to rob their parents’ jewelry store, but it ends in the death of their mother, which sets off a chain of tragic events. As the story unfolds, the relationship between the brothers deteriorates, with Andy becoming increasingly desperate and paranoid. In a climactic confrontation, Andy, driven by despair and betrayal, kills Hank. This act is a culmination of the tension and desperation that has been building throughout the movie, leading to a tragic end for both brothers.