Event: Black Walder - Death (Deaths)

Episode 10: The Winds of Winter at 48:52
Walder Frey lifts up the crust of his meat pie to discover the remains of his sons, Lothar and Black Walder.

Walder Frey: "Where are my damn moron sons? Black Walder and Lothar promised to be here by midday."
Arya: "But they're already here, my Lord... Here, my Lord... They weren't easy to carve."