From the Union Cemetery Book compiled by the Berrien County Genealogical Society....
Francis Nomia Peck Died 28 Sep 1913age 23
Knox I. Peck Died 10 Feb 1888age 1 day
Lutie T. Peck Died 26 Sep 1893age 1 month 13 days
Mary Ann Peck Died 21 Aug 1937age 77
Elizabeth Becker Died 16 Jan 1903age 77 years 3 months 3 days
Morgan Alvin Peck Died 24 Aug 1909age 51 years 4 months 17 days
Oleda Anna Peck Died 27 Apr 1922age 62
No Mary Shaffer's with the death date you have are listed but there are lots of Beckers.Also, in case you don't know.The Becker family in Berrien Center were survivors of the Titanic!I can give you the names, etc. if you want to email me at email@example.com.