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The second male lead role has yet to be cast.
Series producers recast the role played by Merrin Dungey in the springGreysepisode that introducedPrivate Practice.
Credit: Leon Neal/AFP/Getty Images
McDonald most recently starred in NBCsKidnapped.
Columbia Records will releasePlanet Earthon July 24 in the United States.
But Valley and Auberjonois will return on multiple episodes of the ABC series upcoming fourth season.
Emmy winner John Larroquette was earlier announced as joining the cast.
Steven Soderbergh (Oceans Thirteen) was also re-elected as national VP.
