Speaking of the deaths of popular fictional characters, J.K. Rowling — who has quite the made-up body count on her shoulders — is still haunted by her decision to do away with one of her favorite characters. She just can't seem to let this one go.

RELATED: Harry Potter fans relive soundtrack through Berklee group

If you're not a Harry Potter mega-fan, you'll be excused for not knowing that Monday was the anniversary of the Battle of Hogwarts, the completely made up skirmish that ended the celebrated YA series. But just because it's a fake anniversary doesn't mean Rowling can't be sad for real.

"Once again, it's the anniversary of the Battle of Hogwarts so, as promised, I shall [apologize] for a death. This year: Remus Lupin," Rowling tweeted. "In the interests of total honesty, I'd also like to confess that I didn't decide to kill Lupin until I wrote 'Order of the Phoenix.'" So, for all you Potter-verse character death plans completists, there you go.  

RELATED: We're getting a new Harry Potter book after all