There's a prophecy in Game of Thrones that has had a lifelong impact on Cersei and could mean major things about her future. As a child, she was told that she would marry the king, that she would have three children, and that they would all die. All of that came to pass, which lends some credence to the rest of the prophecy: a younger and more beautiful queen would one day overthrow Cersei, and then she would be choked to death by the "valonqar." In High Valyrian, valonqar means "little brother." Cersei interpreted that to mean Tyrion, but many fans suspect it will be Jaime who takes her life instead. But when will Jaime kill Cersei on Game of Thrones?
There's no way to no for sure if Jaime will be the one who kills Cersei, so pinning down when it happens is even more difficult. There are so many different ways to interpret the outcome of the series that it's hard to determine which is the most plausible. Jaime could be the little brother who takes Cersei out at the end, but it's possible she was right the entire time and it was Tyrion. Or maybe valonqar doesn't mean Cersei's little brother at all and it could be anyone's younger brother who does the deed.
But let's look at the odds of it being Jaime. Though he and Cersei are twins, he was younger by minutes, making him technically her younger brother. Their relationship has always been tempestuous but it's grown tenser as each of their children died and they both underwent huge changes. As they're pulled further apart by circumstance, things could become contentious enough between them to lead to more violence.
It would follow a certain kind of narrative logic, too. Their births are so linked that it would make sense for one or both their deaths to be linked in some way as well. They're so important to each other that it makes sense that they would be present for all the huge moments in each other's lives — even if one of those moments is one killing the other. Their relationship has always been twisted.
However, as Nikolaj Coster-Waldau told Harper's Bazaar, this GoT theory could be too obvious. "I heard that theory, and it absolutely makes sense," he said. "It would be a perfect little nod. But who knows? You'll have to watch the show [laughs]. It's a good theory. I always thought maybe it's too neat, but who knows."
If Jaime does kill Cersei, then it's unlikely that it would happen as soon as Season 7. Cersei's story doesn't appear to be anywhere near over yet, and she's one of the most important antagonists in the series. Her death is the kind of major moment that's made for a final season, if not a final episode. No matter who kills her, it seems like she'll be around almost until the bitter end.