I have found a marriage license/application: Name: George Sparks Gender: Male Spouse: Mattie B. Mcarthur Spouse Gender: Female Marriage Date: Aug 20, 1913 Marriage Location: Coeur d'Alene, Kootenai Co., Idaho
This is the only piece of data regarding Mattie and George. He disappeared by 1920 and Mattie was in the census with her mother in Seattle both listed as widowed.
I am hoping there may be a news article about the wedding or some notice that will give me information on George. I don't know his age, place of birth, family - anything.