Marion Ross to Guest Star on Grey's Anatomy

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Marion Ross will soon be popping up on Grey's Anatomy, according to TV Guide.

The 81-year-old actress, beloved for her role as the mom on Happy Days, and more recently seen as the mother of Brothers & Sisters' Nora Walker (Sally Field), Marion will not be crossing over, per se, but playing a new character altogether at Seattle Grace.

"Marion plays an older patient who has an amazing epic love story with another older patient in the hospital," says Grey's Anatomy creator Shonda Rhimes.

"She did beautiful, beautiful work and was delightful."

Marion Ross Pic

Marion Ross' take on her Grey's Anatomy appearance?

"Our two gurneys pass each other – and there is a man I had a romance with fifty years ago," tells Marion, who shares scenes with Sandra Oh's Cristina Yang.

"It was such a joy for me."

She appears May 13.

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.

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Grey's Anatomy Quotes

MEREDITH: "You don't get to call me a whore. When I met you, I thought I had found the person that I was going to spend the rest of my life with. I was done! All the boys and all the bars and all the obvious daddy issues, who cares? I was done. You left me. You chose Addison. I'm all glued back together now. I make no apologies for how I chose to repair what you broke. You don't get to call me a whore."
DEREK: "This thing with us is finished. It's over."
MEREDITH: "Finally."
DEREK: "Yeah, it's done."
MEREDITH: "It is done."

Did you say it? 'I love you. I don't ever want to live without you. You changed my life.' Did you say it? Make a plan. Set a goal. Work toward it, but every now and then, look around; Drink it in 'cause this is it. It might all be gone tomorrow."

Meredith (closing voiceover)