I just watched the last episode. I knew Cat and Robb were going to die because I accidentally spoiled myself but didn't know when or how. That was brutal especially the belly stabbing. I feel more sorry for Cat than I do Robb. She tried so hard to protect her children and the last thing she knows before she dies is that two are missing/dead, the other two captured by the enemy, and one dies right in front of her. I'm rooting for Ayra to murder everyone. Maybe Brienne can help when she hears of Catelyn's death.