I feel sorry for Chloe O'Brian. Morris O'Brian and Prescott O'Brian didn't deserved such a fate. Now we know why she was changed. It was a big shock when I heard it today, it's still a bit is (even when the characters actually don't exist in real life).
Morris was a good kind man and both of them had a son who could live happy live. Yes, we can blame it on Jack Bauer (who didn't know it), since Chloe helped him during Day 8 or the ones who kill them directly.
Now should Jack and Chloe be a couple, but that will never happen, since they are both on the run. Chloe is now on the same situation as Jack was years ago, a widower, in Jack's case a widow.