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Veteran CBS News correspondent Mark Knoller passed away at 73. Known as a presidential historian and statistician, he meticulously documented every presidential action for decades, filling a significant gap in historical records. His dedication extended to sharing his vast knowledge freely with colleagues and the public. Knoller's career spanned eight presidencies, transitioning from radio to Twitter, where he amassed a large following. Tributes from colleagues highlight his kindness, generosity, and unparalleled commitment to journalism.

Prepared by Emily Rhodes and reviewed by editorial team.