If you haven't already located an obituary, these libraries may be able to assist you. Good luck!
Ann Arbor District Libraryhttp://www.aadl.org/contactus/askus
Capital Area District Library (Ingham County) http://www.cadl.org/answers/Ask-a-Librarian/
MI Death Index
Name: William A Urich, Jr.
Birth Date: 28 Apr 1923
Death Date: 9 Jul 1986
Residence: Ingham, Ingham County, Michigan
Place of Death: Ann Arbor, Washtenaw, Michigan
Source: Michigan Department of Vital and Health Records