NEW YORK — One of Bernard Madoff’s sons was found dead of an apparent suicide today on the second anniversary of his father’s arrest, according to a law enforcement official.

Mark Madoff, 46, was found hanged in his apartment in Manhattan’s fashionable SoHo section, according to the official. A family member notified police around 7:30 a.m.

The official was not authorized to speak publicly about the case and spoke to The Associated Press on the condition of anonymity.

Mark Madoff and his brother, Andrew, were under investigation but hadn’t faced any criminal charges in the massive Ponzi scheme that led to their father’s jailing.

Bernard Madoff swindled a long list of investors out of billions of dollars and is serving a 150-year prison term in North Carolina. He was arrested on Dec. 11, 2008, after confessing his crimes to his family.

Madoff’s sons, according to the family’s attorneys, were the ones who turned him in.