Ducks Unlimited has cut ties with a longtime field editor and columnist for the conservation group's magazine after he wrote an article critical of a former board member's legal fight over public access on his land in Montana. Don Thomas, a Lewistown, Montana, writer said Wednesday the Ducks Unlimited magazine editor who fired him on Monday told him the article published last month in the magazine Outside Bozeman upset its subject, media mogul Jim Kennedy, the chairman of Cox Enterprises.