Sarah Chalkeis staying in the Netflix family.
She joins previously announcedKatherine Heiglas the other co-lead of the show based on the best-selling book by Kristin Hannah.
Heigl will also executive produce the adaptation.
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Ben Lawson will play Kates ex-husband Ryan, who also has a long history working with Tully.
The 2008 novel was aNew York Timesbest-seller, and author Hannah will also serve as a co-executive producer.
But shes best known for playing Dr. Elliot Reid onScrubs.
