He killed a White Walker.
Game of Thrones Season 6, Episode 6
She survived a White
Walker, for fuck's sake.
Game of Thrones Season 4, Episode 8
Everyone seems to forget that I was
the first man to kill a White Walker.
Game of Thrones Season 8, Episode 2
But I'm told you killed a White Walker.
Game of Thrones Season 5, Episode 5
But you killed a White Walker.
Game of Thrones Season 5, Episode 10