When The Night Shift comes back for a fourth season, it will be without original cast member Ken Leung. I hear he had an option in his contract not to return. He was invited to continue but decided to pursue other opportunities instead.

Leung, who has been on the show since the pilot, played Dr. Christopher “Topher” Zia, an emergency room doctor who previously helped soldiers who were injured in battle.

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The Night Shift, originally slated for midseason 2014, launched that summer, exceeding ratings expectations and earning a second season renewal. Season 2 aired in midseason 2015, with Season 3 returning to summer this year. The show produced 8 episodes in Season 1, 14 in Season 2, 13 in Season 3, with the same order expected for Season 4.

The Night Shift‘s cast includes Eoin Macken, Jill Flint, Brendan Fehr, Robert Bailey Jr., JR Lemon, Tanaya Beatty and Scott Wolf. The series is produced by Sony Pictures Television.

Leung previously was a series regular on ABC’s Lost and recurred on CBS’ Person of Interest.