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The actress died on Sunday after going into cardiac arrest.
She was scheduled to arrive in Sydney, Australia in early 2010 to record voice work for the update, says Moviehole.
It has not been announced if the part of Gloria will be recast.
Happy Feet 2 in 3D, directed by George Miller, is to open in cinemas on November 18, 2011.
In Monday's latest development, Murphy's autopsy results did not point to foul play or any specific cause of death.
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