Graham, best known from the longrunning "Gilmore Girls," steps into the "Parenthood" ensemble as a replacement for Maura Tierney (MOHR'-uh TEER'-nee). Tierney was forced to drop out of the series this summer after being diagnosed with breast cancer, for which she continues to get treatment.
Originally slotted for a fall premiere, "Parenthood" is now set to debut in early 2010. NBC said Monday that production begins in mid-November.
Also starring Craig T. Nelson, Bonnie Bedelia and Mae Whitman, the series is based on the 1989 movie that starred Steve Martin.
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