During an appearance at this weekend's London Film and Comic Con, the 35-year-old actress said she was happy to learn about her ultimate demise on the HBO series because she was dying to work on her film "In Darkness", reported Digital Spy.
"I finally made the movie that I wrote. It took about eight years to get it together - it's hard to make an independent movie - and if I'd still been in 'Game of Thrones' I wouldn't have been able to make 'In Darkness'.
Dormer, however, said "Game Of Thrones" showrunners David Benioff and DB Weiss had already told her about Margaery's death more than a year before she was killed onscreen in the season six finale.
"We all have to dedicate, like, six months of our lives to Game of Thrones every year. As actors we do get frustrated if we can't do the other jobs we want to do in the other months of the year.
"So I phoned Dan and David because there was a job that I really wanted to do and they said 'No, you can't do it, we won't release you from the schedule' and I was really upset and they said, 'But don't worry Natalie, we're gonna kill you next year'.
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