In the story, it is revealed that Mrs. Mallard's husband, Mr. Mallard, has died in a tragic accident. As the story progresses, Mrs. Mallard experiences a range of emotions, including shock and grief, upon learning about her husband's death. However, towards the end of the story, it is revealed that Mr. Mallard is actually alive and that the news of his death was a mistake. This shocking revelation causes Mrs. Mallard to die of a heart attack, making her the one who dies at the end of the story.