here's some legal document on the case:
http://law.justia.com/cases/federal/district-courts/illinois/ilndce/1:2013cv03270/282950/75/
"He asked the judge to dismiss the case, arguing that he should not be tried in Illinois. But Judge Gary Feinerman of United States District Court decided in April this was a dispute that could be resolved only at trial.
“The presence of the Lakehead and the Seafarers records for Doige, but not for Doig, certainly favors Doig,” Judge Feinerman said in his decision. “There is no doubt about that. But it’s not strong enough evidence, given all of the evidence in the record,” the judge said, to eliminate any chance that Doig “was not the person at Thunder Bay who was the author of the painting.”"
http://www.nytimes.com/2016/07/10/arts/design/peter-doig-painting-lawsuit.html?_r=0