A billionaire art dealer must return an Amedeo Modigliani painting to the estate of a Jewish man who was robbed of it during the Nazi occupation of France. The 1918 oil portrait, which depicts a chocolate merchant in a hat and tie, was once valued at around $25 million, according to The New York Times. On Friday, New York Supreme Court Judge Joel M. Cohen said the work known as 'Seated Man With a Cane' originally belonged to Oscar Stettiner, an antiques dealer who had a shop in Paris. He ordered billionaire David Nahmad, whose holding company now owns the...