Quote from Signate67:
My guess is that the money was genuinely lost. In an attempt to make back money lost and not reported, it all just got out of hand.
I'm not so sure about this. I agree with you about the sons possibly knowing something and then turning him in as a cover but what is peculiar is that he was supposedly avoiding reporting requirements with the SEC by going all cash just prior to the reporting deadline. That means that if he was in legitimate positions he supposedly liquidated regardless of price.
Maybe that's what happened and caused the losses but in most Ponzi schemes the losses usually occur from funding lifestyles and paying back early investors and funding redemptions as they come in not in actual investments or trading losses. I doubt that he was ever actually trading much and was really just robbing Peter to pay Paul and using his name and status to further the scheme. It took a huge amount of redemptions all at the same time and no new money coming him to finally push in into a corner.