Board Thread:TV Show Discussion/@comment-32689253-20170726162052/@comment-28895263-20170801154029

He might just quietly disappear from the story; others have.

We're not actually sure where he is, anyway. Walder Frey said that he was back in a cell. But Ser Jaime promised him comfortable quarters at Casterly Rock as a reward for his cooperation. He might have left for the Rock with a detail of Lannister soldiers at any time between dinner, and Arya's dessert tray.

He could even be in a cell at Highgarden.