If only J.K. Rowling had a time-turner handy. The author of the Harry Potter series seems to be facing a lot of regret lately ? she tweeted an apology Saturday for killing off fan-favorite character Fred Weasley. Fred met his demise during the Battle of Hogwarts, killed by an explosion outside the Room of Requirement in Deathly Hallows. May 2 was the anniversary of the epic battle and his death, which left the Weasley family, including twin brother and best friend George, in shambles.