Today marks the anniversary of the 'Battle of Hogwarts,' and J.K. is apologizing for another 'Potter' death

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May 2 may seem like an ordinary day to some; but to Potterheads, it's the mark of the sad, but triumphant Battle of Hogwarts.

SEE ALSO: 8 insanely cool (and secret) facts about the Wizarding World of Harry Potter in LA

The gruesome events that took place in "Harry Potter and the Deathly Hallows," ended the Second Wizarding War, and quite a few lives as well. Author J.K. Rowling takes to Twitter every year to divulge the one character that she apologizes for killing (last year it was Fred Weasley). This time, it was Remus Lupin.

Rowling took to Twitter to express to all "Harry Potter" fans her guilt. "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 wrote on Twitter.

As we all know (well, all Potterheads know), Professor Remus Lupin was introduced in the third book, "Harry Potter and the Prisoner of Azkaban," as the new Defense Against the Dark Arts teacher. Lupin was a friend of Harry's parents, and he and his wife Nymphadora Tonks play a huge role in "Harry Potter and the Order of the Phoenix."

Check out her full explanation in her Twitter apology below.

Long live Lupin.

Check out more Potter love in the gallery below.

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Today marks the anniversary of the 'Battle of Hogwarts,' and J.K. is apologizing for another 'Potter' death
UNIVERSAL CITY, CALIFORNIA - APRIL 05: View of Hogwarts Castle at the opening Of 'The Wizarding World Of Harry Potter' at Universal Studios Hollywood on April 5, 2016 in Universal City, California. (Photo by Todd Williamson/Getty Images)
An interior view of Hogwarts is seen during the 'Wizarding World of Harry Potter Opening' press preview at Universal Studios Hollywood in Studio City, California, on April 6, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
A guest looks to purchase a magic wand inside Ollivanders during a soft opening and media tour of "The Wizarding World of Harry Potter" theme park at the Universal Studios Hollywood in Los Angeles, California in this picture taken March 22, 2016. REUTERS/Kevork Djansezian
Guests shop inside Dervish and Banges general store in Hogsmeade Village during a soft opening and media tour of "The Wizarding World of Harry Potter" theme park at the Universal Studios Hollywood in Los Angeles, California in this picture taken March 22, 2016. REUTERS/Kevork Djansezian
Novelties sit inside Weasleys' Wizard Wheezes during a media preview for The Wizarding World of Harry Potter-Diagon Alley at the Universal Orlando Resort in Orlando, Florida June 19, 2014. The new attraction, which opens to the public on July 8, expands the original Harry Potter world, which opened in 2010 and is modeled after Hogsmeade Village, which is located near the Hogwarts School of Witchcraft and Wizardry where the series' leading character Harry Potter begins his magical adventures. REUTERS/David Manning (UNITED STATES - Tags: ENTERTAINMENT SOCIETY)
Guests look at a display of candy inside the Honeydukes sweets shop in Hogsmeade Village during a soft opening and media tour of "The Wizarding World of Harry Potter" theme park at the Universal Studios Hollywood in Los Angeles, California in this picture taken March 22, 2016. REUTERS/Kevork Djansezian
View of the train in Hogsmeade at the Grand Opening of the 'Wizarding World of Harry Potter' at Universal Studios Hollywood, in Universal City, California, on April 7, 2016. Fifteen years after Harry Potter's first big screen adventure, Universal is enchanting a new generation of Muggles with its most spectacular conjuring trick yet -- a theme park in the heart of Hollywood. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
View of the train in Hogsmeade at the Grand Opening to the public of the 'Wizarding World of Harry Potter' at Universal Studios Hollywood, in Universal City, California, on April 7, 2016. Fifteen years after Harry Potter's first big screen adventure, Universal is enchanting a new generation of Muggles with its most spectacular conjuring trick yet -- a theme park in the heart of Hollywood. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
Fans discover Hogsmeade at the Grand Opening of the 'Wizarding World of Harry Potter' to the public at Universal Studios Hollywood, in Universal City, California, on April 7, 2016. Fifteen years after Harry Potter's first big screen adventure, Universal is enchanting a new generation of Muggles with its most spectacular conjuring trick yet -- a theme park in the heart of Hollywood. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
Fans walk through Hogsmeade at the Grand Opening to the public of the 'Wizarding World of Harry Potter' at Universal Studios Hollywood, in Universal City, California, on April 7, 2016. Fifteen years after Harry Potter's first big screen adventure, Universal is enchanting a new generation of Muggles with its most spectacular conjuring trick yet -- a theme park in the heart of Hollywood. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
Fans read the Hogsmeade newspaper at the Grand Opening of the 'Wizarding World of Harry Potter' to the public at Universal Studios Hollywood, in Universal City, California, on April 7, 2016. Fifteen years after Harry Potter's first big screen adventure, Universal is enchanting a new generation of Muggles with its most spectacular conjuring trick yet -- a theme park in the heart of Hollywood. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
A waiter serves butterbeer in Hogsmeade at the Grand Opening of the 'Wizarding World of Harry Potter' to the public at Universal Studios Hollywood, in Universal City, California, on April 7, 2016. Fifteen years after Harry Potter's first big screen adventure, Universal is enchanting a new generation of Muggles with its most spectacular conjuring trick yet -- a theme park in the heart of Hollywood. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
Fans experiment the interactive wand on some of the window in Hogsmeade at the Grand Opening of the 'Wizarding World of Harry Potter' to the public at Universal Studios Hollywood, in Universal City, California, on April 7, 2016. Fifteen years after Harry Potter's first big screen adventure, Universal is enchanting a new generation of Muggles with its most spectacular conjuring trick yet -- a theme park in the heart of Hollywood. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
UNIVERSAL CITY, CALIFORNIA - APRIL 07: A general view of atmosphere at the Official Opening Of 'The Wizarding World Of Harry Potter' At Universal Studios Hollywood at Universal Studios Hollywood on April 7, 2016 in Universal City, California. (Photo by Gabriel Olsen/FilmMagic)
UNIVERSAL CITY, CALIFORNIA - APRIL 07: A general view of the atmosphere during the official opening of 'The Wizarding World Of Harry Potter' At Universal Studios Hollywood on April 7, 2016 in Universal City, California. (Photo by Tommaso Boddi/WireImage)
LOS ANGELES, USA - APRIL 6: People visit shops at Hogsmeade village in 'Wizarding World of Harry Potter' theme park at Universal Studios Hollywood, in Los Angeles, USA on April 6, 2016. (Photo by Mintaha Neslihan Eroglu/Anadolu Agency/Getty Images)
LOS ANGELES, USA - APRIL 6: Store keeper poses in front of a shop at Hogsmeade village in 'Wizarding World of Harry Potter' theme park at Universal Studios Hollywood, in Los Angeles, USA on April 6, 2016. (Photo by Mintaha Neslihan Eroglu/Anadolu Agency/Getty Images)
LOS ANGELES, USA - APRIL 6: People visit Hogsmeade village in 'Wizarding World of Harry Potter' theme park at Universal Studios Hollywood, in Los Angeles, USA on April 6, 2016. (Photo by Mintaha Neslihan Eroglu/Anadolu Agency/Getty Images)
An interior view of Magic Wand hop in Hogwarts is seen during the 'Wizarding World of Harry Potter Opening' press preview at Universal Studios Hollywood, in Studio City, California, on April 6, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
An interior view of Hogwarts is seen during the 'Wizarding World of Harry Potter Opening' press preview at Universal Studios Hollywood in Studio City, California, on April 6, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
An exterior view of Hogwarts is seen during the 'Wizarding World of Harry Potter Opening' press preview at Universal Studios Hollywood in Studio City, California, on April 6, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
An exterior view of Hogwarts is seen during the 'Wizarding World of Harry Potter Opening' press preview at Universal Studios Hollywood in Studio City, California, on April 6, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
An exterior view of Hogwarts is seen during the 'Wizarding World of Harry Potter Opening' press preview at Universal Studios Hollywood in Studio City, California, on April 6, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
An exterior view of Hogwarts is seen during the 'Wizarding World of Harry Potter Opening' press preview at Universal Studios Hollywood in Studio City, California, on April 6, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
An interior view of Hogwarts is seen during the 'Wizarding World of Harry Potter Opening' press preview at Universal Studios Hollywood in Studio City, California, on April 6, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
An exterior view of Hogwarts is seen during the 'Wizarding World of Harry Potter Opening' press preview at Universal Studios Hollywood in Studio City, California, on April 6, 2016. / AFP / VALERIE MACON (Photo credit should read VALERIE MACON/AFP/Getty Images)
UNIVERSAL CITY, CALIFORNIA - APRIL 05: A general view of the atmosphere during the Universal Studios Hollywood Hosts The Opening Of 'The Wizarding World Of Harry Potter' at Universal Studios Hollywood on April 5, 2016 in Universal City, California. (Photo by Tommaso Boddi/WireImage)
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