How Walder Frey Dies?
Shortly After the Lannister Army Leaves, Walder Dines on a Piece of Pie as a Serving Girl Brings Him Another Piece. Walder Is Killed by Arya Stark, Avenging...
Shortly after the Lannister army leaves, Walder dines on a piece of pie as a serving girl brings him another piece. Walder is killed by Arya Stark, avenging the Red Wedding.
How did Lord Walder Frey die?
In season six's finale, Arya served Walder Frey a slice of Frey pie before slitting his throat.
Did Walder Frey eat the pie?
Arya then served the pie to their father, Walder Frey, before revealing herself as a Stark and slitting his throat. This is a plotline adapted from the books, only Arya has nothing to do with "Frey Pies" in George R.R. Martin's writing.