NEW YORK, (Reuters) - Her husband is the one  accused of the biggest fraud in Wall Street history, but Ruth  Madoff’s name also keeps coming up in investigators’ pursuit of  assets linked to Bernard Madoff.

From mailing more than $1 million worth of jewelry and  watches in violation of a court order, to withdrawing $15.5  million before his Dec. 11 arrest and an attempt to separate  $70 million in her assets from his purported fraud, Ruth Madoff  has added intrigue to the case.

Married to the accused swindler for nearly 50 years, Ruth  Madoff played no formal role at her husband’s company and has  not been accused of any wrongdoing, but the revelations have  raised eyebrows among those following the Madoff case.

“Where does Mrs Madoff get the millions of dollars from?  Mrs Madoff was not known as the genius on Wall Street  independently,” said Michael Shapiro, a partner at Wall Street  law firm Carter, Ledyard and Milburn LLP, which represents some  of the once-respected investment manager’s former customers.

“What did she do to earn that money? I’m wondering what her  explanation will be.”

Authorities said Madoff, 70, confessed to running a $50  billion scheme over many years on his own, bilking investors  all over the world. He has not formally appeared in court to  answer one criminal charge of securities fraud.

The latest mention of his wife is a court order in the  civil case on Monday in which her lawyer asserts that about $70  million in her name is unrelated to the purported fraud and  separate from his assets.

The Madoffs’ lawyer, Ira Sorkin, said “we stand by what is  in the order” and declined further comment.

Last month, the Massachusetts state regulator said Ruth  Madoff withdrew $15.5 million in the weeks before Madoff’s  arrest from Cohmad Securities Corp, a brokerage partly owned by  Bernard L. Madoff Investment Securities LLC. Monday’s filing in Manhattan federal court said  she had $45 million in municipal bonds at Cohmad.

In December, Madoff and his wife mailed jewelry and watches  to family and friends in violation of a court order freezing  his assets. Their lawyer successfully argued in court in  January that Madoff could remain out on bail and under house  arrest. Ruth Madoff also agreed to a voluntary asset freeze.

She has a degree in psychology and another in nutrition and  was co-author of a 1996 cookbook called “The Great Chefs of  America Cook Kosher: Over 175 Recipes From America’s Greatest  Restaurants.”

The book was not a big seller and The New York Times  reported in January that the book’s editor, food and wine  expert Karen MacNeil, said she was paid to write all of it.

Legal experts say that, if Bernard Madoff is convicted,  prosecutors would need to show his wife’s assets were earned  through his business or that she was directly involved, in  order to seize them.