Mark Knoller, a veteran CBS News White House correspondent who covered five presidents over a three-decade career, has passed away.

CBS News announced Knoller’s death on Saturday. The outlet reported that a close friend said he died in Washington, D.C. The cause of death was not disclosed, but he had diabetes and was in poor health.

Knoller was 73.

“Friends and colleagues remember Knoller as a legend,” CBS News wrote on Instagram. “For decades, everyone in the White House press corps knew him as the unofficial presidential historian and statistician,” the outlet added.

“Mark Knoller was the hardest-working and most prolific White House correspondent of a generation,” Tom Cibrowski, president and executive editor of CBS News, added. “Everyone in America knew his distinctive voice and hi

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