The Michigan Division of Vital Records and Health Statistics set up a website where you can search an index to death records for all Michigan counties from about 1867 to 1882. I saw about a dozen Connors/Conners, but nothing came up under O'Connor. Some were from Detroit and some from Sault St. Marie, and other places. See: http://www.mdch.state.mi.us/PHA/OSR/gendis/index.htm None of my family is from Michigan but it's an interesting site.