Berkshire Hathaway, the conglomerate run by billionaire Warren Buffett, said longtime vice chairman Charlie Munger died peacefully on Tuesday morning at a California hospital.

Munger was 99, and would have turned 100 on Jan. 1.

He died peacefully, Berkshire said.

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No cause was given.

“Berkshire Hathaway could not have been built to its present status without Charlie’s inspiration, wisdom and participation,” Buffett, Berkshire’s chairman and chief executive said in a statement.