In just a few short months, Game of Thrones will return with Season 6, debuting on Sunday, April 24 at 9 PM ET on HBO. Aside from a few cryptic trailers, photos and posters, we haven't seen much of this new season yet, and HBO hasn't even released an official plot rundown. Fans are even more in the dark this season because the show has caught up to George R.R. Martin's books, and it still isn't known when he'll publish his long-awaited sixth book, The Winds of Winter. IGN caught up with George R.R. Martin, who teased that one of his upcoming books has a twist which won't be able to be used on the series.

"It involves a couple of characters, one of whom is dead on the show but not dead in the books. The show can't do this stuff, because they killed a character that I have not killed. I get all this stuff about being bloody-minded, but [showrunners David Benioff and D.B. Weiss] are bloodier than I am."
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While the series has largely stuck close to the novels, there are numerous characters who are still alive in the books that have been killed off in the series. Most recently, the series killed off Stannis Baratheon (Stephen Dillane), with Brienne of Tarth (Gwendoline Christie) finally getting a chance to avenge Renly Baratheon's (Gethin Anthony) death. However, we never actually did see the death blow, since the director cut away before Brienne could bring her sword down.

Others who have died in the show, but not the books include Barristan Selmy (Ian McElhinney), who, in the novels, is left in charge of Meereen after Daenerys Targaryen (Emilia Clarke) left on her dragon. In the books, Catelyn Stark (Michelle Fairley) did die in the infamous Red Wedding, although she was later resurrected as Lady Stoneheart through the powers of Thoros of Myr, a follower of The Lord of Light, like Melisandre (Carice van Houten).

Many have wondered if Melisandre (Carice van Houten), who was seen mourning Stannis in the season finale last year, will use her powers to bring both Stannis and the beloved Jon Snow back from the dead. It's also worth noting that both Stannis' wife and daughter are still alive in the books, along with Meryn Trant, who was killed by Arya Stark (Maisie Williams). Who do you think this twist involves? Chime in with your thoughts and stay tuned for more on Game of Thrones.