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The Letter is the twentieth episode of the eighth season of ER, and the one hundred seventy-eighth episode overall.
Guest Stars: Paul Benjamin (Al Ervin), Chris Burke (George), Ellen Crawford (Lydia), Deezer D. (Malik), Yvette Freeman (Haleh), Lily Mariye (Lily), Monte Russell (Zadro), Troy Evans (Frank), Jason Padgett (Bartender), Kay Panabaker (Melissa), Mekhi Phifer (Dr. Gregory Pratt), Lisa Vidal (Sandy Lopez), Lynn A. Henderson (Olbes), Michael Adler (Nick), Joanie Fox (Waitress), Dinah Lenney (Shirley), Garrett Pennell (Skateboarder), Reed Rudy (Dan Rue), Vanna Salviati (Italian Gamma), John Siciliano (Toby), Giovanni Srchia (Vinny), Robby Sutton (Holden), Emily Wagner (Pickman)
Greene faxes a letter to the ER staff; on the last page of the letter, Corday writes that Mark died which causes the staff to grieve about his loss in their own way; Carter confronts Abby about her alcohol problem and Abby ends up going to an AA meeting; Romano operates on a young girl who is diagnosed with cancer after she is brought to the ER with her father due to a car accident; Pratt learns that he will be doing his internship at County.