Tremont is among more than 225 former Madoff investors who have received such letters from Picard, on the grounds that the money belonged to other investors, because Madoff never generated any real investment profits. Picard wants to recoup the disbursed funds to have more money to repay investors for their losses. He has threatened to sue anyone who doesn’t return the funds.

MassMutual maintains that the losses racked up by investors in its hedge fund group, Tremont Group Holdings Inc., are their own – and not the responsibility of the insurance company. Tremont had the second-largest loss among Madoff clients after Fairfield Greenwich Advisors, a New York hedge fund that lost $7.5 billion.