J.K. Rowling apologizes for another death in 'Harry Potter' and explains why she did it

"Harry Potter" author J.K. Rowling kept her tradition of apologizing and explaining one death on the anniversary of the Battle of Hogwarts on Monday.

The bloody battle saw Voldemort's forces descend on Harry Potter, his teachers, his classmates, and the secret society of wizards against Voldemort, The Order of the Phoenix.

This year, Rowling chose to explain why Remus Lupin "had to die."

Professor Lupin was a friend of Harry Potter's parents while they attended Hogwarts, and became one of Harry's substitute parents. He was also a werewolf, having been bitten by the werewolf Greyback at a young age. He died during the Battle of Hogwarts. His death hit fans especially hard, because his wife Tonks also died, leaving their young son an orphan.

Last year, on this day, Rowling apologized for killing Fred Weasley during the Battle, which she said was the "worst [death] for me, so I started with him."

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