NEW YORK — Andrew Madoff, Bernard Madoff’s last surviving son, died of cancer Wednesday, years after turning his father in and insisting he had been duped like the rest of the world into believing the notorious Ponzi king was an honest financier.

Andrew Madoff, 48, was “surrounded by his loving family” when he died at a hospital from mantle cell lymphoma, said his attorney, Martin Flumenbaum.

Andrew Madoff and his brother, Mark Madoff, worked on the legitimate trading side of their father’s Manhattan firm, two floors removed from the private investment business where Bernard Madoff carried out his $65 billion Ponzi scheme over several decades.

Bernard Madoff, 76, was arrested in December 2008. He pleaded guilty to fraud charges months later and is serving a 150-year sentence at a federal prison in North Carolina. Mark Madoff hanged himself in his Manhattan loft apartment in 2010.

Andrew Madoff was diagnosed with the rare form of cancer in 2003 but went into remission. He blamed the relapse on the stress of living with his father’s scam.