User blog comment:Kiwi 1998/HP/@comment-PJO Crossover!/@comment-1897744-20100307011354

Except I'm not; I'm referencing the kitchen scene in Half Blood Prince. When RON gets his prefect letter.

And it's because Fred Weasley (middle name not known) was killed during the Battle of Hogwarts on May second, 1998. Cause of death was most likely trauma due to a wall falling on him after it came tumbling down during the battle; the one who bashed the wall in is most likely Augustus Rookwood. Fred's death took place on page 637 of the US edition of Harry Potter and the Deathly Hallows.

Fred Weasley was twenty at the time of his death, having turned so a month and a day previous.

Rest in Peace.

(^ all of that without looking, and I could go on with more.)