John Dickerson will leave CBS News at the end of the year, a move that will inevitably raise questions about the future of “ CBS Evening News ,” which he has been co-anchoring with Maurice DuBois as part of a format revamp since earlier this year.

“I am extremely grateful for all that CBS gave me — the work, the audience’s attention and the honor of being part of the network’s history — and I am grateful for my dear colleagues who’ve made me a better journalist and a better human,” the anchor said in a social-media post on Monday. “I will miss you.”

In a memo to staffers, CBS News President Tom Cibrowski said Dickerson “had decided” to step away from his role at the Paramount Skydance news operation. At the same time, it’s no secret that “Evening News” has suffered in the ratings si

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