Daniel Simon has been Sully' s best friend since childhood. As adults, Sully went to Nevada to help Daniel start his own mining business, which made Daniel very successful.
Daniel came to Colorado Springs at the secret request of Brian because the family was having some financial trouble.
Sully didn't want Daniel help him with the loan so he found a job out of town to make some money. While Sully is out of town and Preston is foreclosing on the homestead. Michaela accepts help from Daniel. When Sully is back, he insists on paying him back. Also, Daniel gives Michaela business advice on charges and book keeping.
Eventually, Daniel falls in love with Michaela, and Sully figures it out. Daniel and Sully then have a falling out. They manage to mend their friendship and in then he leaves from town on the train.
Soon, he returns to Colorado Springs when he learns that Sully is one of the most wanted and that he is missing. Daniel joins Michaela and Robert E. in their search for Sully. After a few days, they find him injured in the forest. Michaela treats his wounds, and Daniel helps her hide him from the soldiers, who search for him in the area. At the same time, Daniel becomes the sheriff of Colorado Springs.