Helen Hunt was approached to step in for Tierney, but a deal could not be made.
"Parenthood" is a contemporary take on Ron Howard's 1989 movie. The series, created by Jason Katims, revolves around four adult siblings (Peter Krause, Erika Christensen, Dax Shepard, Graham) and their parents (Bonnie Bedelia and Craig T. Nelson).
"Parenthood" was slated for a fall launch but pushed to midseason after Tierney's illness was discovered in July.
(Editing by SheriLinden at Reuters)
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