Former House star Lisa Edelstein is joining the cast of Castle for a multiple-episode arc.

The actress – who played Dr Lisa Cuddy, opposite Hugh Laurie’s Gregory House – will appear as Rachel McCord, a tough and highly-skilled Federal Investigator who plays a vital role as Kate Beckett’s determines her future.

Since leaving House in 2011, one season before the incredibly popular medical drama ended, Edelstein has guest-starred on several top US shows, including The Good Wife, Elementary, House of Lies and, most recently, Scandal.

Castle season five continues on Wednesday nights on RTÉ One.