A brief biography of Charles Goodnight at pbs.org. http://www.pbs.org/weta/thewest/people/d_h/goodnight.htm Goodnight
According to this item, Loving died after an attack by Commanches.
Brief descriptions of the cattle trails across the southwest, including the Goodnight-Loving, at this website: http://www.over-land.com/trwestsouth.html Trails West