Dozens of artworks by leading modernists from Rothko to de Kooning, Motherwell to Pollock, that were sold to New York galleries through Long Island art dealer Glafira Rosales are still under investigation by the FBI as possible forgeries. Recently added to complicated tale is Rosales' longtime companion, Jose Carlos Bergantiños Diaz, who was involved in a lawsuit over a counterfeit Basquiat painting.

Diaz is linked to two lawsuits with Christie's.

In 2007, Christie's was sued by an art dealer and a collector over a Basquiat that they claimed the auction house knowingly sold to them even though its authenticity was in question.

The case was dismissed. Diaz, who was not a defendant in the case, was the consignor.