A new fan theory posits that Littlefinger (Aidan Gillen) will kill a member of the Stark family during “Game of Thrones” Season 6. HBO

Winter is coming, and so could more bad news for fans of the Starks on HBO’s “Game of Thrones.” Petyr Baelish, also known as Littlefinger, made his return in episode 4 of Season 6, and some believe he may not have the best intentions in mind for Sansa and her family. A new theory indicated he could once again be responsible for the death of a Stark.

One Reddit user suggested that Littlefinger (Aidan Gillen) could kill Rickon (Art Parkinson) to make Sansa (Sophie Turner) the Wardeness of the North. Publicized by Mashable, the theory holds that Jon Snow’s (Kit Harington) forces would defeat Ramsay Bolton’s (Iwan Rheon) troops in battle. Littlefinger would then ride ahead of Jon to Winterfell where he would kill Rickon and make it look like Ramsay did it.

The theory isn’t that far-fetched considering what Littlefinger has already done during the series. He betrayed Ned Stark (Sean Bean), conspired to poison Jon Arryn (John Standing) and killed Lysa Arryn (Kate Dickie) to take control of the Vale. It would come as no surprise to many were he to kill Rickon to further his own agenda. Littlefinger is currently bringing the army of the Vale to aid Sansa and protect her from the Boltons.

Rickon is a prisoner of Ramsay on the show, and things aren’t looking good for him in Winterfell. Osha (Natalia Tena) attempted to kill Ramsay in episode 4, but he was aware of her tricks and he slew her before she could stab him. Rickon is now Ramsay’s lone prisoner, and this could be very bad news for the Stark heir, especially after what Ramsay did to Theon Greyjoy (Alfie Allen).

The Starks have been the victims of many killings on “Game of Thrones.” Many fans are hoping nonetheless that Rickon survives his current predicament and joins up with Jon and Sansa. In the next episode of “Game of Thrones,” Sansa will question Littlefinger about why she made him marry Ramsay. The episode 5 promotional video shows her asking him if he knew what a monster Ramsay is before he arranged their marriage. Sansa may seek to take her revenge on Littlefinger, which might put the kibosh on the theory about him killing Rickon. However, Littlefinger will most likely talk himself out of it, as he always does.

Watch the promo video for episode 5 below:

“Game of Thrones” Season 6, episode 5 airs on HBO Sunday, May 22, at 9 p.m. EDT.