THIS JUST IN: #GreysAnatomy Taps @AmyAcker to Play Derek's MIA Fourth Sister Kathleen Shepherd tvline.com/2019/02/13/amy… @caterinatweets @GreysABC

@TVLine @AmyAcker @caterinatweets @GreysABC Congrats 🎉 @AmyAcker

@TVLine @AmyAcker @caterinatweets @GreysABC Who else burst out laughing when they said “... her specialty is psychiatry...”

@TVLine @AmyAcker @caterinatweets @GreysABC Does no one on Grey's pay any attention to time? Based on the entire show, Derek would be in his early 50's and Kathleen was older. Never mind, they obviously don't. Very poor casting.

@TVLine @AmyAcker @caterinatweets @GreysABC @GreysAnatomy Staff: So, Doctor Kathleen - where did you get your medical training? Kathleen AKA #Root: Well...

@TVLine @AmyAcker @caterinatweets @GreysABC THE BEST CASTING. 🙌

@TVLine @AmyAcker @caterinatweets @GreysABC Root on her new mission by the Machine :D

@TVLine @AmyAcker @caterinatweets @GreysABC THIS IS THE BEST NEWS

@TVLine @AmyAcker @caterinatweets @GreysABC I miss Root. She was such a great character on Person of Interest.

@TVLine @AmyAcker @caterinatweets @GreysABC Amy Acker in Grey's Anatomy????? 😍😍😍

@TVLine @AmyAcker @caterinatweets @GreysABC Why do I so get the feeling that she is coming to the show to be there for Amelia when she is not doing well after things go bad with Leo. Kathleen will take her away (Amelia written off the show). Just a thought.

@TVLine @AmyAcker @caterinatweets @GreysABC What is this GIF from?? It has Root written all over it but I can’t place it...

@TVLine @AmyAcker @caterinatweets @GreysABC Amy Acker is a goddess. Greys is about to be so amazing 🙌🏻🙌🏻🙌🏻❤️

@TVLine @AmyAcker @caterinatweets @GreysABC A+ gif. good job

@TVLine @AmyAcker @caterinatweets @GreysABC @AriyahV look at this fucking gif and tell me if there’s another person on the planet who can smile in that particular way and look that good. Jeeeeezus

@TVLine @AmyAcker @caterinatweets @GreysABC WHAT??? I didn’t wait for 15 years for Kathleen Shepherd not to be played by Lauren Graham!

@TVLine @AmyAcker @caterinatweets @GreysABC 👍👍😊😊

@TVLine @AmyAcker @caterinatweets @GreysABC I was re-watching Dollhouse the other day, so Amy as a doctor in @GreysABC would fit from the role played in Dollhouse as Dr Saunders. I do miss Amy as Root in Person of Interest like many others.

@TVLine @Eli5Cullen @AmyAcker @caterinatweets @GreysABC @Annaira1595 @xfunnygirl !

@TVLine @AmyAcker @caterinatweets @GreysABC Does this mean no more The Gifted?

@TVLine @AmyAcker @caterinatweets @GreysABC Wawww

@TVLine @greysfan @AmyAcker @caterinatweets @GreysABC Oooooo

@TVLine @GreysABC @AmyAcker @caterinatweets @chrissiono1 @rebeccaAGJ

@TVLine @AmyAcker @caterinatweets @GreysABC How many times can I heart this?

@TVLine @AmyAcker @caterinatweets @GreysABC root meets greys omg

@TVLine @AmyAcker @caterinatweets @GreysABC O yeahhhhhh

@TVLine @KhaleesiKerscht @AmyAcker @caterinatweets @GreysABC Woooow!!! 👏🏽👏🏽👏🏽

@TVLine @AmyAcker @caterinatweets @GreysABC Yay!!!!!! I ❤️ that @tynedalyonline plays Amelia and Derek’s Mom.

@TVLine @GreysABC @AmyAcker @caterinatweets I am so disappointed they didn’t cast Lauren Graham as Kathleen. She would be a better pick🙄

@TVLine @AmyAcker @caterinatweets @GreysABC Sister astrid/ nova 😍😍😍😍

@TVLine @GreysABC @NoorPatty @Daniaelian AHHHHH!

@TVLine @AmyAcker @caterinatweets @GreysABC Yay! :)

@TVLine @AmyAcker @caterinatweets @GreysABC Awesome actor! I don’t watch the show but kudos for the decision.

@TVLine @AmyAcker @caterinatweets @GreysABC great! Now I have to start back watching Grey's Anatomy 🙄🙄🙄🙄

@TVLine @AmyAcker @caterinatweets @GreysABC

@TVLine @AmyAcker @caterinatweets @GreysABC All rooting for you 😳👍😂

@TVLine @GreysABC @AmyAcker @caterinatweets Who?