Who Dies in the Game of Thrones Season Finale?

I don't know who's more deserving of death, Joffrey or Tywin, but it's so satisfying to see the man who's orchestrated so much pain, including his son Tyrion's, get killed off. On Tyrion's prison-escape murder rampage, he finds his father on the toilet, confronts him about his horrible parenting, and shoots him with a crossbow.