‘Chicago Med’ Sneak Peek: ‘Grey’s’ Alum Brooke Smith Guest Stars in the Mysterious Fall Finale (VIDEO)

Chicago Med - Season 4
Elizabeth Sisson/NBC

You might not know her name but you probably know her face — Brooke Smith is one of TV’s most reliable stars.

The actress is probably best known for her role in Grey’s Anatomy as Dr. Erica Hahn, the first same-sex partner of Sara Ramirez’s Dr. Callie Torres. But you may also recognize her from shows like Ray Donovan, Bosch, Bates Motel, and The Good Doctor.

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Torrey DeVitto is welcoming an old friend on set.

She’s about to appear in the A&E/History Channel, UFO series Project Blue Book, premiering January 8, and on Chicago Med’s December 5 winter finale, “Death Do Us Part,” Smith will play Amber Young, a woman involved in a stabbing at her home.

She’s the one with bloody hands in our exclusive first look below. At the same time, a man with a kitchen knife lodged in his chest is wheeled in to the hospital — apparently the burglar that Young says she discovered robbing her place. What really happened, we can say, is a lot more mysterious.

Also on the episode: Rhodes (Colin Donnell) operates on a patient who is a witness of great importance to Det. Halsted (Jesse Lee Sofer) and Charles (Oliver Platt) and Goodwin (S. Epatha Merkerson) disagree on a patient’s treatment.

Plus, as Will (Nick Gehlfuss) and Natalie (Torrey DeVitto) prepare for their wedding, the groom-to-be unexpectedly finds himself sidetracked from his holy matrimony chores to make a house call. Let’s hope it’s not somebody on the wrong side of the law again!

Chicago Med, Wednesdays, 8/7c, NBC