Catelyn Stark's Murderer Might Be Coming Back With Walder Frey In 'Game Of Thrones' Season 6, But What About Lady Stoneheart? [SPOILERS]

When it comes to the different Houses in 'Game of Thrones,' there is no doubt that the Freys are the second least popular Northerners (second only to the Boltons, thanks to Ramsey's evil ways). But despite the fact that they are some of the most hated 'Game of Thrones' characters, fans believe that Walder Frey and his family will be returning in the sixth season since the North will be engaged in a major battle soon.

So is Walder Frey coming back in 'Game of Thrones' Season Six?

It was previously reported that 'The Strain' star David Bradley has been spotted on his way to Belfast and might have been shooting a few scenes as Walder Frey. Now, it sounds like his son Black Walder (better known as the guy who slit Catelyn Stark's throat) might be returning as well.

In an interview with Your Letterbox magazine, Tim Plester spoke about playing one of the most despised character in 'Game of Thrones' and the possibility of his return.

"When people ask me if Black Walder and his trusty blade will ever be making a re-appearance in the fictional realm of Westeros, all I'm (contractually) allowed to say is that he's not dead yet, and so there's always a chance," Plester admitted, adding that the character might not be welcome to attend certain occasions.

"I think it's fairly safe to assume that I won't be getting invited to any more weddings!" he said.

But what could happen to Walder Frey and Black Walder when they do return to 'Game of Thrones?' Some fans believe it is time for the Starks to seek vengeance for the deaths of Robb and Catelyn. There is even a theory that the resurrected Catelyn Stark aka Lady Stoneheart will be the one to kill all the Freys.

Although Michelle Fairley has been seen in Ireland as well, the actress who played Catelyn Stark has vehemently denied the appearance of Lady Stoneheart in 'Game of Thrones.'

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