Late to this thread, but this link from the Wooden Shoe Trails helped me a lot on Nicholas:http://homepages.rootsweb.ancestry.com/~jackott/EmStory2.htm
Last weekend I found the grave of Nicholas' 2nd wife, Antonette, at the Holy Martyrs of Gorcum Cemetery (The Prince of Peace Catholic Church) in Green Bay. On the headstone it looks like "Antonetta" was used as the name. I could not find the headstone for Nicholas. The cemetery is split in two between new and old with Antonette in the new and I suspect Nicholas who passed in 1893 is in the old cemetery.