Castle Season 4 Spoiler: New Details About Mystery Person Returning During May Sweeps!

Last week, we reported that someone we haven't seen all season long will return to Castle during May sweeps. Now, we have more info about said mystery man … or perhaps we should say, mystery woman.  According to TV Line, the person is female, and "she has ties to a former series regular."Here's our first stab (no pun intended) at a list of possible female suspects: Johanna Beckett: Kate's deceased mom (most likely in a flashback, or — in what would be the most epic twist of all...


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