The son of convicted fraudster Bernard Madoff, Mark Madoff, has been found dead in his New York City apartment in an apparent suicide.

‘He was found … in his apartment. It was an apparent suicide,’ New York City police spokesman Paul Browne said.

Mark Madoff and his brother Andrew were being investigated in the case that saw their father jailed.

Bernard Madoff is serving a 150-year prison sentence for masterminding a massive 'Ponzi' pyramid scheme that swindled investors out of billions of dollars.

In June of 2009, the 71-year-old was ordered to spend the rest of his life behind bars after admitting 11 charges of fraud, perjury and false reporting relating to the $65bn scam.