I don't know why, but I've the bitter feeling that Jack killed Irina, and they're going to make it look like he did it for a very valid reason. For example that she begged him to do it because she was deadly sick or because she preferred to die in his hands that in the hands of the enemy, I don't know. Something similar to what happened in "Repercussions" when Sydney stabbed Vaughn. The main difference is that I believed Sydney's reasons. I don't know if I'm going to believe Jack's.
They're probably gonna give a reason that would "justify" Jack's actions, at least in the eyes of some fans (I can already hear them
). But not mines, mind you.
Maybe Irina left some letters for her daughters, explaining the situation that led Jack to her killing, so Sydney and Nadia can forgive him. I'm already crying.
IMO, that turn of the story would suck on so many levels, basically because there are SO many ways to keep Irina in the dark. You just have to use your brain (you know, that little (or big) thing inside your head
) instead of saying "Kill her off, because I don't see any other solution."
Of course if you don't care at all about Irina there isn't any other solution.
The saddest part is that there are fans who are already counting on Irina's death. For their own sellfish purposes, of course. And they're going to be so dissappointed if she isn't the dead one. So, after all, Irina has become another Lauren. Sad.