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Madoff suffered heart attack in prison last month

Ponzi scammer Bernard Madoff, shown here in this 2009 file photo, is back in prison after being hospitalized last month for a heart attack.
Ponzi scammer Bernard Madoff, shown here in this 2009 file photo, is back in prison after being hospitalized last month for a heart attack.BRENDAN MCDERMID / Reuters

Convicted fraudster Bernard Madoff is back in prison after being hospitalized for a heart attack last month, CNBC has learned.

Madoff, 75, also has stage four kidney disease, but is not receiving dialysis.

Madoff, who has served less than five years of his 150-year prison sentence for running the largest investment fraud in U.S. history, confirmed the details of his health in an email to CNBC. Madoff says he was hospitalized last month at Duke University Medical Center, and has since been returned to the medium security federal prison in nearby Butner, N.C.

The U.S. Bureau of Prisons declined to comment on Madoff's condition or treatment. 

—By CNBC's Scott Cohn. Follow him on Twitter @ScottCohnCNBC