Burt Young, the actor best known for his Oscar-nominated performance as Sylvester Stallone’s sidekick in “Rocky,” has reportedly died.

He was 83.

His death was confirmed Wednesday by his daughter, Anne Morea Steingieser, according to The New York Times.

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The Post has contacted a rep for Young for comment.

“To my Dear Friend, BURT YOUNG, you were an incredible man’s and artist, I and the World will miss you very much…RIP,” Stallone wrote in a tribute posted to Instagram.

Young had over 160 film and television credits to his name, including “Chinatown” and “Once Upon a Time in America.”

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More to come…