Read this passage from “The Story of an Hour.” Why is this passage ironic?

It was her sister Josephine who told her, in broken sentences; veiled hints that revealed in half concealing. Her husband's friend Richards was there, too, near her. It was he who had been in the newspaper office when intelligence of the railroad disaster was received, with Brently Mallard's name leading the list of "killed." He had only taken the time to assure himself of its truth by a second telegram, and had hastened to forestall any less careful, less tender friend in bearing the sad message.

Her sister is the one who tells her, but her sister never liked her husband.

There was more than one person named Brently Mallard on the train.

Richards had checked the truth of the news, but it turned out to be wrong.

Her husband had been traveling by train and there was no railroad disaster.