Juanita, In general, the families wrote the obits. I do believe that "more famous" people had obits that the papers might have written. But for the most part, it would be family. And you have to realize that like today, not everyone was given an obit. For whatever reason?
Sometimes there is information from funeral homes and from the cemetery. I believe you said that your person was Catholic. I would try contacting Mt. Olivet in Wheat Ridge,Co. They are very helpful. It is worth a shot. Good Hunting, Frank