Castle Season 4 Spoiler: Someone We Haven't Seen All Season Will Return!

Break out your Season 1-3 DVDs and start looking for clues, Castle fans, because someone we haven't seen at all this season will be returning to our small screens sometime during May sweeps, according to TV Line. But who?! Well, there's always the ever-elusive Triple Killer (3XK), whose return show creator Andrew Marlowe hinted at last month when he told TV Guide that producers were "in talks" about whether to write him back in. But Marlowe was also a bit tentative, saying that a 3XK return...


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