This is all I found, don't know if this is your Samuel or not:
Beverly Repass Hoch & Mary B. Kegley, Wythe Co, VA Marriages 1790 - 1853, p. 107
Jan 19, 1820: James Miller and Sidney Creager, d/o Peter Creager, deceased; Surety Samuel L. Miller, son of Adam Miller who stated Sidney was upwards of 21 years of age; consent of Adam Miller for his son James to marry.
Adam Miller did not leave a will when he died abt 1834 Wythe County
Hope this helps