While the infamous Red Wedding on HBO's "Game of Thrones" came as a huge shock to many viewers, others who'd read George R.R. Martin's books knew all along it was coming.

But now, those readers will be in for heart-stopping surprises, as well, because Season 5 will feature the deaths of characters that did not occur in the books.

According to the Independent, at the Writers Guild West Awards, Martin teased, "People are going to die who don't die in the books, so even the book readers will be unhappy. So everybody better be on their toes. David [Benioff] and D.B. [Weiss] are even bloodier than I am."

The "Game of Thrones" showrunners have already killed off a few characters that are still alive in the books -- including Khal Drogo's bloodrider Mago, Daenerys Targaryen's handmaiden Irri, and Quarth merchant Xaro Xhoan Daxos.

Benioff and Weiss have been tinkering with the adaptation from the books as each season has passed; season 1 was the most faithful. But as they get deeper into Martin's series, books are getting longer and more complicated, and the writers are patching together different parts of different books. Season 4 was adapted from the second half of Book 3, "A Storm of Swords," as well as bits of Books 4 and 5, "A Feast For Crows" and "A Dance With Dragons."

That mixing and matching will lead to what actress Sophie Turner (Sansa Stark) described as "massive moments, perhaps even more shocking than the Red Wedding type of thing."

We'll be sure to take our heart medication.