William Walter Horner of Medford, NJ and formerly of Mount Holly, NJ passed away on Tuesday, December 26, 2017. He was 78 years old.   Mr. Horner is survived by his wife of 56 years, Barbara J. Horner (nee Smith); children, Debra J. Clark, William R. Horner (Mary Lou Mattera), Jennifer L. Noseworthy (Christopher); grandchildren, Alexander Nelson Clark, Ryan William Clark, Kennedy Noseworthy; and brother Russell Horner.   At the request of the family, services and final disposition will be private.