Register of St. Martin German Evangelical Church, Cincinnati, Ohio, 2:30, Gestorbene (burials) 1858, no. 4, Maria Margaretha Wiemann, shows date.
Müller-Koppe, Jens, "Wiemann Research Report", reporting that he had reviewed burial records until 1852, and marriage records until 1840, finding no record of her death or re-marriage in the parish. Since she would have been age 73 in 1852, it seems likely she died after that time.