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meow
I don't think Mac feels guilty for Aiden't death, either. He may feel a little guilty on having fired her like that, and maybe now he would change it if he could, but I think deep inside he knows that was the right thing to do. No one, no matter the reasons, can compromise and change evidence like she did, as much as they want to and know that the suspect is guilty. So Aiden did it, she had to be fired, I suppose. Everyone else would have had the same punishment.
Anyway, if she was still a CSI she wouldn't have been so focused on Pratt, and probably he wouldn't have had killed her.
So, and much as this is so hard for me to tell, probably Aiden's death was more her fault than anyone elses.
Well, except for Pratt, of course, he is the only one really guilty for it...But if we consider that her death could be avoided, than I think Aiden would have been the only one able to do that, if she hadn't become so obcessive with the whole case.
But she was just doing what she thought was the right thing, putting herself in danger to not let him free, and she eventually did it. Not just the way she was expecting at first, but she did it anyway. And I would even say that in the moment she was there with him, about to dye, Aiden wasn't that regretful for everything she did after being fired, as she then knew that there was now the chance to nail him, so she got it
Afterall, she died, but she did what she really wanted to. And even though it was not in a normal way, if it wasn't her intellingence, he could still be free, so I think the fact that she died for her cause shows us how Aiden was persistent and strong, and how she wouldn't give up on her objective