Baron Nelson was a huge man - a few inches over seven feet tall, and about 300 pounds. He had long white hair and a matching beard.
He was driven mad by the loss of his son; when the companions arrived in Vista, he wanted Dean for his own (and one of the women for his wife). He sent the men off to Yuma bring back some or all of the people who killed his son - the deal was that they had ten days; if they made it back, everyone would go free. His mother, who was more insane that he was, let slip his plans to betray them and keep Dean and one (or both) of the women and tried to kill all three, so Dean killed her and Krysty was forced to kill the baron (Shockscape).