Veteran CBS News White House correspondent Mark Knoller , whose tenure spanned three decades and five presidents, has died at the age of 73, the broadcaster’s news division announced today .

The organization cited a close friend, who said Knoller died in Washington, D.C. While a cause of death was not revealed, the longtime reporter had diabetes and was in ill health.

“Friends and colleagues remember Knoller as a legend. For decades, everyone in the White House press corps knew him as the unofficial presidential historian and statistician,” read a statement on CBS News’ social media .

Tom Cibrowski , president and executive editor of CBS News, said of the journalist: “Mark Knoller was the hardest-working and most prolific White House correspondent of a generation. Everyone in

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