Is Castle going to revisit the story of Beckett's mother's murder this season? — Houston
ADAM: That's the plan for one of the show's January episodes, and executive producer Andrew W. Marlowe expects it to be a blockbuster. "There will be some closure; we'll have some understanding as to exactly why Joanna Beckett was killed," Marlowe teases. "The audience will find out how high the conspiracy goes and the elements that we're dealing with. I think it can provide us with an interesting insight into [future] storytelling."
Source: TV Guide