Malvina A. Foster (wife) died.

The evidence

• “June 23, 1847, married Miss Malvina A. Foster, a native of Michigan, who died Aug. 5, 1860 ; they had three sons. He married again, in 1864, Miss Anna B.”

  1879-history-of-rock-county/26-bios-la-prairie.md, PDF p. 831 / book p. 835

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

  Grade A: Found on a page of one of our sources