Where is Irony in 'A Rose for Emily'?

It is Ironic in the end of the story, that Miss Emily Grierson. High aristocratic "southern Belle" would stoop so low as to murder her lover Homer Barron. Throughout the story you do not expect that after Emily's death the townspeople will find Homer's body laying in a bed where it has been for the last forty years. The way the story is told is that Homer had left Emily, so it is shocking to find that he has been murdered by Miss Emily.