Is there anyone who could look up a death record for me or locate an obituary for Esther Hansen Thorstensen?

She was born 4 Jun 1907 - lived in Tyler, Lincoln, Minnesota but according to SSDI died May 1981 in Wisconsin - last residence was Somerset, Saint Croix County.

She was married to Otis Thorstensen October 22, 1929 in Minnehaha County, South Dakota. He died 1975 in Lincoln Co. MN.

Am desperately trying to find names of her parents and any relatives. She may have been born in Illinois - according to the 1930 census.