“CBS Evening News” co-anchor Maurice DuBois is leaving the network amid a larger overhaul of the struggling news program.

He announced his exit Thursday on Instagram , saying his last day at the network where he worked for 21 years will be Dec. 18.

DuBois — who is best known for anchoring WCBS-TV in New York — nabbed the co-anchor spot at “CBS Evening News” with co-anchor John Dickerson last January.

“It has been the honor of a Lifetime,” DuBois wrote. “21 years altogether, including my time at WCBS-TV in New York City. What a privilege! To be welcomed in your homes night after night, delivering the news / meeting extraordinary people telling their stories.”

Dickerson revealed in late October that he was leaving the network at the end of the year — foreshadowing CBS News’ first rou

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