Maurice DuBois , a TV anchor who has won notice for his unruffled delivery of even the most shocking headlines, will leave CBS News amid a larger overhaul of the unit’s “CBS Evening News” after a revamp of its format spurred noticeable ratings declines.

DuBois revealed his departure Thursday via a post on Instagram, noting that December 18 would be his last day at the Paramount Skydance news division. He has spent 21 years at CBS-owned properties, primarily making a name for himself as an anchor at WCBS, the company’s New York flagship.

John Dickerson, the co-anchor of the current edition of “ CBS Evening News ,” announced his intention in October to leave CBS News His “Evening News.”

Such anchor departures, made without the naming of a replacement, are quite unorthodox, but CB

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