The sixth season of Game of Thrones is very near coming to a close. However, throughout the course of Season 6, Game of Thrones has once again omitted a key storyline from the A Song of Ice and Fire book series. However, there’s now substantial evidence that Catelyn Stark will return to the show as Lady Stoneheart in the upcoming tenth and final episode of the season.

This post contains spoilers for the A Song of Ice and Fire books.

Viewers of Game of Thrones will be more than aware that Catelyn Stark died at the end of the show’s third season. However, whilst the character in the HBO fantasy drama remains very much dead, her storyline takes a different path in George R.R. Martin’s book series. That’s because, three days following her death, Catelyn Stark is revived by Lord Beric Dondarrion as Lady Stoneheart, a wholly different character to Catelyn Stark, without the ability to speak and consumed with a desire for vengeance for herself and her family.

Game of Thrones is absolutely introducing Lady Stoneheart this Sunday -… https://t.co/IPxwgM30as #GameofThrones pic.twitter.com/yfDus5Ek05 — Game of Thrones (@gameofthronestv) June 23, 2016

Lady Stoneheart finds herself leading Dondarrion’s Brotherhood Without Banners, killing Lannisters, Freys, and Boltons for their involvement in her house’s demise. However, it’s a storyline that the producers of Game of Thrones have chosen to omit from the TV show, but that could all be about to change.

According to Polygon, there’s been considerable evidence over the course of Game of Thrones Season 6 that the show plans to introduce Lady Stoneheart in the season finale. This is evident by the show’s decision to mention Catelyn Stark in places where she wouldn’t necessarily need to be mentioned. For example, she was shown dying during one of Bran’s visions in Episode 6. Furthermore, Catelyn’s daughter Sansa is consistently being told that she’s similar to her mother, whilst Catelyn is also a topic of discussion between Edmure Tully and Jaime Lannister.

'Game of Thrones' actor performs Lady Stoneheart's introduction https://t.co/i1sx4m9MDR — TIME.com (@TIME) June 14, 2016

That being said, Lem Lemoncloak, a prominent member of the Brotherhood Without Banners, is dead, and the show has already shown us that. It’s led many to suggest Lemoncloack now being out of the story is likely to mean that Lady Stoneheart’s appearance is unlikely. However, it’s worth remembering that Game of Thrones has strayed away from its source material considerably this season, meaning that there’s plenty of room for the show to introduce largely adapted segments of the storyline from the book series.

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Also worth taking into consideration is the distance of time between the Red Wedding and Season 6. In the book series, Catelyn Stark was resurrected just days following her death, but years have now passed in the TV show. However, that’s not to suggest Catelyn Stark isn’t alive in the TV show and we just haven’t seen her yet.

Who dies? Who survives? HOW DOES IT END? #GameOfThrones Season 6 concludes Monday 2am/9pm. #GoTAtlantichttps://t.co/32YUhSdiiR — Sky Atlantic (@skyatlantic) June 21, 2016

According to the Independent, following the airing of Game of Thrones Season 6 Episode 9, as is customary, HBO released a teaser trailer for Episode 10. That teaser trailer provided the biggest hint that Lady Stoneheart will finally make her appearance in the season finale. A snippet in the trailer shows Walder Frey celebrating his successes at a dinner party set-up not all that dissimilar to the Red Wedding, which couldn’t make for a more suitable time for Lady Stoneheart to turn up and cause chaos.

Lady Stoneheart’s appearance won’t be confirmed until the season finale of Game of Thrones airs on Sunday. However, it’s now an almost certainty that Catelyn Stark’s re-incarnation, Lady Stoneheart will finally make her way to the TV adaptation of Game of Thrones.

[Image via HBO]