Beals, who viewers last saw in 'The Chicago Code,' will appear in two episodes of the ABC drama as Sophia Conrad, "a smart, commanding and sexy CIA operative," TV Guide reports.
Beals' character has a past with Richard Castle and joins him and Beckett to search for a CIA agent who has gone rogue. The rogue agent is a key suspect in a murder case Beckett and Castle are trying to solve.
Beals' episodes will air as a two-parter in February.
In other casting news ...
Ed Asner is reuniting with Betty White. The 'Mary Tyler Moore Show' actors will appear together in an episode of 'Hot In Cleveland' set to air next summer. No details on Asner's role have been revealed. [EW]
'Spy Kids' star Daryl Sabara will guest star on 'Grimm.' Sabara will be appear alongside 'Necessary Roughness' actress Hannah Marks in a 'Hansel and Gretel'-themed episode. [EW]
Jami Gertz is eying a return to TV in a new ABC sitcom. Gertz will play the mom of a family who moves into an exclusive gated community only to find out their neighbors are aliens posing as humans. [Deadline]
Lisa Rinna is returning to 'Days of Our Lives.' Rinna will reprise her Billie Reed role and share "explosive" scenes with her on-screen mom played by Lauren Koslow and her character's former lover, played by Peter Reckell. [THR]