According to Zap2It, Game of Thrones is not done with the casting for the fourth season.
It seems like Joseph Gatt won’t be playing the character of Styr, and that the Russian actor, Yuri Kolokolnikov will take this role.
After many months of speculations about the characters, a name has finally been decided. According to Zap2It, Kolokolnikov seems to be the last actor cast for the Season 4, which is filming right now in Europe.
Styr is a leader of the Thenn who allies himself with Mance Rayder to attack the Wall.
Season 4 of Game of Thrones will premiere in the Spring of 2014.