(CNN) -- The death of Mark Madoff, the son of convicted Ponzi-schemer Bernard Madoff, was ruled a suicide by the New York City medical examiner's officer on Sunday, a day after the victim's body was discovered hanging from a ceiling pipe in his SoHo apartment.
Ellen Borakove, a spokeswoman for the medical examiner, said the autopsy was completed around 1 p.m. Sunday. Borakove said medical examiners will conduct toxicology and tissue tests on the body. The result, she said, will not be made public unless Madoff's next of kin asks for the case file.
Madoff killed himself two years to the day after his father was arrested for swindling $50 billion from investors in the largest Ponzi-scheme in U.S. history.
None of Madoff's immediate family members have commented on his death. However, the attorney who represents the victim's mother, Ruth, said she "is heartbroken."
The attorney, Peter Chavkin, responded by e-mail and said Ruth Madoff would not provide additional information.
Mark Madoff killed himself while his wife was out of town and his 2-year-old son was asleep in a nearby bedroom, early Saturday morning, authorities said. Madoff's body, fully clothed and hanging from a living room pipe, was discovered by his father-in-law around 7:30 a.m. The boy was not harmed.
Mark Madoff's attorney, Martin Flumenbaum, on Saturday called his client's death. "a terrible and unnecessary tragedy."
"Mark was an innocent victim of his father's monstrous crime who succumbed to two years of unrelenting pressure from false accusations and innuendo," Flumenbaum said. "We are all deeply saddened by this shocking turn of events."
Bernard Madoff is currently serving a 150-year prison sentence for masterminding the largest Ponzi scheme in U.S. history. Madoff bilked investors out of $50 billion by masquerading his investment firm as legitimate when it was nothing more than a front. He used funds from new investors to send payments to his earlier investors, falsely portraying them as proceeds from investments, when they were actually stolen money, prosecutors said.
The 71-year-old Madoff pleaded guilty to the charges in 2009 and is now incarcerated at the Butner Federal Correction Complex, a medium-security prison in eastern North Carolina.
Bernard Madoff's criminal activities have spawned a tidal wave of civil actions against Mark Madoff, his mother, siblings and hundreds of other defendants, accused of profiting off the Ponzi scheme by withdrawing more money from Madoff's fund than they invested, money they presumably thought was investment income.
A person familiar with the Madoffs says Mark Madoff has not been in touch with his extended family for the past two years.
Irving Picard, the court-appointed trustee in charge of recovering and distributing Madoff's assets, has filed a slew of lawsuits in U.S. Bankruptcy Court in Manhattan over the past week on behalf of some of Madoff's victims.
One filed on December 8 named Mark Madoff -- as well as his brother Andrew Madoff and uncle Peter Madoff -- as one of several defendants in a civil lawsuit.
On Saturday, Picard issued a brief statement expressing his condolences.
"This is a tragic development, and my sympathy goes out to Mark Madoff's family," he said.
The other defendants include JPMorgan Chase, HSBC, UBS, an Austrian banker, and two accountants who are accused of knowing about the fraud but covering it up and profiting from it.
The majority of Madoff's victims did not invest directly in his firm. They invested in third-party feeder funds, and therefore don't qualify for the financial protections extended to direct investors.
So far, 16,394 claims have been filed by investors who say they lost money.
The majority of the claims -- 13,054, or nearly 80% of the total -- have been denied, because the investors were invested through feeder funds.
From CNN's Miguel Susana in New York