German art hoarder Cornelius Gurlitt, whose secret collection included many Nazi-looted pieces, has died aged 81. More than 1,400 works were found in his Munich apartment, including pieces by Picasso and Matisse. Many were feared lost or destroyed before tax investigators uncovered his priceless collection in 2012. Cornelius Gurlitt, who had been seriously ill after heart surgery, was the son of Adolf Hitler's art dealer, Hildebrand Gurlitt. Last month, he reached a deal with the German authorities: he said he would co-operate with authorities to determine which of the paintings were stolen by Nazis during World War Two. Those which could be shown to have been stolen, he would return; the rest, he would keep.