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Oh, his girlfriend! AUDREY RAINES! Yeah, they could kill her off. Especially since they really need a gripping death that affects Jack personally in each season. And obviously his brother's death just didn't bug him all that much. And I have a feeling his dad's wouldn't either.
And although Kim's death would tear him apart, somehow I just don't see them killing her off. (She's out for now anyway, since she just wrote him off and said she had to just not be part of his life. Can't say I blame her.)
I personally can't imagine working in an office environment where people routinely undo each other's work and hack into each other's computers as soon as they step away to take a pee. I mean, c'mon -- this is supposed to be high-level security and everybody can just hack into anything at any time?
And can't those people get some decent LIGHT BULBS??