Bonnie Lou Berthiaume (Williams), of West Branch, formerly of Bay City, MI, passed away December 14, 2010 at Brian's House-Bay, age 65 years.  She was born in Bay City on September 22, 1945 to the late Mervin and Jessie (Sherman) Williams.  Bonnie was a member of Messiah Lutheran Church in Bay City.  Survivors include her husband, Robert L. Berthiaume, whom she married July 18, 1964; two children, Robert (Jackie) Berthiaume, Jr. and Tracy (Mike) Kasperski; three grandchildren, James (Michelle) Morrow, Alec Kasperski and Jessie Kasperski; one great-grandchild, Kyle Morrow, as well as a brother, Richard (Dawne) Williams.  She was preceded in death by two brothers, James and Robert Williams.  A memorial service was held on December 20, 2010 at Messiah Lutheran Church, officiated by Rev. Andreas Teich.