Grey's Anatomy/Piece of My Heart

Piece of My Heart
Season 4, Episode 13
Airdate	May 1, 2008
Production Number	41374
Written by	Stacy McKee
Directed by	Mark Tinker
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Grey's Anatomy — Season Four

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Piece of My Heart is the thirteenth episode of the fourth season of Grey's Anatomy, and the seventy-fourth episode overall.

Starring: Ellen Pompeo (Meredith), Sandra Oh (Cristina), Katherine Heigl (Izzie), Justin Chambers (Alex), T.R. Knight (George), Chandra Wilson (Miranda), James Pickens, Jr. (Richard), Sara Ramirez (Callie), Eric Dane (Mark), Chyler Leigh (Lexie), Brooke Smith (Erica), Patrick Dempsey (Derek)

Guest Starring: (in credits order) Kate Walsh (Dr. Addison Montgomery), Amy Madigan (Dr. Wyatt), Elizabeth Reaser (Rebecca Pope), Clea Duvall (Jennifer Robinson), Lauren Stamile (Nurse Rose), Kathleen Rose Perkins (Sarah), Ken Barnett (Freddie), Jason O'Mara (Phillip Robinson), Sam Daly (Will), Meg Cionni (Nikki Jones), John O'Brien (Lab Tech), Gloria Garayua (Intern Graciella), Tymberlee Chanel (Intern Claire), Winston Story (Intern Leo), Joy Osmanski (Intern Lucy), Molly Kidder (Intern Megan), Richard Keith (Intern Mitch)