As HBO's hit fantasy series Game of Thrones moves forward without new novels from George R.R. Martin to directly adapt, The Walking Dead creator Robert Kirkman believes showrunners David Benioff and Dan Weiss should have had to craft the show's ending without guidance from the author.

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In an interview with Rolling Stone , Kirkman expressed his "disappointment" in how Game of Thrones is going beyond GRRM's collection of published novels, as Season 6 continues the story while Martin has yet to finish The Winds of Winter . Benioff and Weiss have spoken about how Martin sat down with them and explained how his story would end, giving them the major plot points for how to end the TV series.Asked if he has an ending in mind for his Walking Dead comic books, Kirkman told Rolling Stone he does. However, when he was asked if he would ever tell the producers of the show what it is, he replied, "I would never do that. That's the one thing I'm disappointed in George R.R. Martin for doing. He should have just been like, 'F**k you. You make it up now, I'll get to mine when I'm ready.'"Do you think GRRM should have forced HBO to come up with its own ending for the hit fantasy drama? Let us know in the comments, and for more on Game of Thrones, check out this new batch of images featuring Bronn and the Blackfish

Alex Osborn is a freelance writer for IGN. You can follow him on Twitter