After graduating from the University of Minnesota Law School, Stelle Smith practiced law in Worthington for over twenty years. In 1921 he moved to Minneapolis where he continued to practice and pursue business interests until his death in May 1952, at age seventy-six.
Though a modest, taciturn man, he belonged to many social and professional organizations. He also enjoyed athletics and was a skilled pistol marksman.
In 1919, he met in St. Louis with other like-minded citizens to form the American Legion. He served in the Minnesota National Guard for years, attaining the rank of Colonel.
After his death, the Hennepin County Bar Association presented a memorial to him in District Court.