The money stolen from investors, however, allowed all the Madoff family members, including Mark, to live lives of luxury.
Squillari said it wasn't strange that a man raised in wealthy surroundings would come to think of having lots of money as normal. "We all would be living that fabulous lifestyle if we had been born into it," said Squillari. "You wouldn't think twice about it."
But even in death, Mark Madoff will continue to be the target of efforts to recover that money. The bankruptcy trustee tasked with recovering funds for victims of Bernie Madoff's Ponzi scheme say Mark and his children received tens of millions of dollars stolen in the scam.
A lawsuit filed last week alleged Mark and others in the family committed accounting fraud as company executives.
The trustee has alleged in one of the lawsuits filed that "if the Family Members had been doing their jobs -- honestly and faithfully -- the Madoff Ponzi scheme night never have succeeded, or continued for so long."
"Some of these people were in control or were absolutely in a position to understand what was going on," said Stephen Harbeck, president of Securities Investor Protection Corporation (SIPC), the federally mandated non-profit corporation that protects investors against fraud. SIPC pays the legal fees of the Madoff victims' court-appointed bankruptcy trustee.
Bernie Madoff, 72, is now serving a 150-year sentence in a North Carolina federal prison. It's not known how he got word of his son's death in prison, but he and Mark had not spoken in two years, and the suicide may have been a message.
"I'm thinking Bernie got the message," said Eleanor Squillari.
Asked if she thought the elder Madoff deserved to get that message, Squillari said, "Mark didn't deserve to die, but Bernie deserves to be where he is. I'm very angry at Bernie."
Bernie Madoff's lawyer Ira Sorkin told ABC News that Bernie would not be attending the funeral of his son out of consideration for his daughter-in-law and grandchildren. Sorkin said Bernie Madoff would conduct a private memorial in prison. He would not comment on whether Madoff had ever asked permission to leave prison to attend, or whether the family had extended an invitation.
Meanwhile, on the new "Rest in Peace Mark Madoff" Facebook page, high school friend David Nadler called Mark Madoff "one of the best people I ever knew."
In a separate post, Ed Langone wrote that the "very sad news" of Mark's death made him "think back to the days of the Heights School, East Hills, when everybody was just little kids, and the real world hadn't set in yet." Both are grade schools in Roslyn, New York, where Mark grew up. "A terrible tragedy all around, I feel sorry for his kids," wrote Langone.
Another poster, who identified herself as a former Madoff employee in London, wrote "SLEEP TIGHT MARK XXXXX."
On Good Morning America Monday, financial journalist Diana Henriques of the New York Times said that as the second anniversary of Bernie Madoff's arrest drew near, Mark had become despondent about the renewed publicity and the lawsuits from the bankruptcy trustee.
"The drumbeat of litigation had become an enormous burden," said Henriques. "Things were building."