"The Story of an Hour"

I thought "The Story of an Hour" was a decent short story. It wasn't the most exciting story i have ever read but it showed a real life scenario of this women loosing her husband in this accident. The only part i didn't understand was at the end when it said "But Richards was too late... she had died of heart disease- of joy that kills." The way it seemed to me was that she was just depressed after her husband died but also a little relieved. If Richards would of had the information right, that her husband wasn't even near the accident, none of this would of ever happened.