In a statement Wednesday, the network and production company Shine America said they and Michaels have decided to part ways, and she won't be back on “Biggest Loser” this fall.
This is the third time that Michaels, known for her tough, drill-sergeant approach when working with contestants, has left the series.
Asked if she might return again, a production company spokesman said the focus was on the upcoming season, No. 16.
There was no immediate response Wednesday from Michaels' representative to an email request.
Michaels' replacement on “The Biggest Loser” was not announced.
The series is scheduled to return to NBC in September.
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