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Old November 19 2013, 06:05 PM   #171
cardinal biggles
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Re: Castle - Season 6 Discussion & Spoilers

I think the "X" is meant as a multiplication symbol — he kills in groups of three, and is also referred to as the "Triple Killer". I can't remember if they called him that in last night's episode, but certainly in previous seasons they used both nicknames.
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