Katharine McPhee's nanny identified in fatal Toyota dealership collision.
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Yadira Calito, 55, died from accidental collision in Los Angeles.
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Two others injured in the accident but survived.
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Calito was a nanny for McPhee and David Foster's son.
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McPhee cited undisclosed family tragedy for missing shows.
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McPhee and Foster were on a tour in Asia.
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Foster's tour set to continue in November in the United States.
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