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 time — she's not really dead)
Gina: Castle's book publisher and ex-wife
Meredith: Castle's first wife and Alexis's mom
Kyra Blaine: Castle's college girlfriend
Jordan Shaw: An FBI agent who assisted Castle and Beckett on a case in Season 2
Evelyn Montgomery: Captain Montgomery's widow

Of those women, both Johanna and Evelyn have ties to Castle's deceased captain, Roy Montgomery, who was a series regular.

What do you think, Castle fans? Is the returning character one of the ladies on our list, or someone else?

Let's try to solve this mystery before the episode airs! Tell us your theories in the comments below.

Source: TVLine


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