The death of Nevada City native William Kelly - whose frozen body was discovered on Miners Trail under the Broad Street bridge Sunday night - is raising concerns about the treatment of the homeless in Nevada City.It is not clear whether Kelly died from exposure - or even exactly when he died. But according to several people in the community, Kelly had complained that his gear, including his bedding, had been taken by Nevada City Police.This is the second recent incident in which a homeless man was found dead on a freezing-cold night; Mark Rye was found in his sleeping …