In a Twitter post over the weekend, "Harry Potter" author J.K. Rowling expressed that she's really sorry about writing off Fred Weasley from the story. As fans will remember, the character died during the Battle of Hogwarts at the end of "Harry Potter and the Deathly Hallows," the seventh book in the Harry Potter series.

Fred was one of Ron Weasley's playful pranksters of an elder brother and a twin. His death left a huge mark among fans of the series because not only was Fred likable and amusing, his death also meant that his twin brother George would move on without having him in his life. Fred and George were inseparable.

But he wasn't the only character who died during that monumental battle, and it looks like Rowling wants to commemorate the tragic event to one apology per year.

The author continued to tweet, in response to a fan: "I thought I might apologise for one death per anniversary. Fred was the worst for me, so I started with him."

This isn't the first instance Rowling has expressed regrets over killing a character. The best-selling author also made an apology last December for a minor character's demise. She was referring to Florean Fortescue, the ice cream shop owner at Diagon Alley, who was kidnapped by Death Eaters and later killed by Voldemort.

Last year, Rowling also sent out a tweet in remembrance of the Battle of Hogwarts. She stated that she's taking a moment of silence to acknowledge all the characters who died in the final book.

Here is J. K. Rowling's 2015 Battle of Hogwarts commemoration tweet:

And J. K. Rowling's 2014 Battle of Hogwarts commemoration tweet: