Was that the Oakland County guy?
RE: which killer in Michigan....
Good question.
I should begin by advising women to read the novel Love in the Time of Serial Killers by Alicia Thompson. Nothing to do with this one but the title should remind women to be careful with the creepy males around them.
https://www.thriftbooks.com/w/michigan-murders_edward-keyes/357748/item/2221379/?utm_so
https://murderpedia.org/male.C/c/collins-john-norman.htm
https://www.themidwestcrimefiles.com/post/the-ypsilanti-ripper-the-victims-of-john-norman-collins