I’m not related to any member of this family.

TRY - Find a grave – FREE SITE - volunteer site all states; frequently has headstone pic
DO NOT SEARCH FOR A MARRIED WOMAN USING HER MAIDEN NAME.

http://www.worldvitalrecords.com/


Try Vital Records – Birth, Marriage, & Death, Social Security Info. – FREE ALL STATES
http://search.labs.familysearch.org/

For that time period, death certs are not FREE or online.
You will need to order his death cert directly from the IONIA county clerks office. There are no restrictions for ordering MICH. death certs. Many counties do not permit public browsing of vital records [birth, marriage, death].
Many counties will not do telephone look-ups.