How does the author use foreshadowing in A Perfect Day for Bananafish?

Over the course of the story, the reader is invited (if not roughhoused) into going back through the story after the report of the pistol. After Seymour pulls the trigger, Muriel, of course, awakens, sees her dead husband and—eventually, readers can assume—begins traveling on the same train of thought as the reader: Why did he do it? What was the origin of this terrible event? Did it just sneak up on him, or was it a long time coming? A reader cannot imagine that Seymour killed himself for reasons unknown, nor will Muriel be able to brush off her husband's death with the same logic. Readers go back over the story and look for what clever critics would call "foreshadowing" or what psychologists would label "cries for help."