I found the information on Joachim Ziegemeyer on Family Search.org. He has some of my family line in it, but he has generations mixed up, so it isn't accurate. There are 3 Joachim Ziegemeiers buried in All Saints Cemetary in St. Peters, MO. One whose last name is spelled Ziegemeyer on the stone--I don't know if it was a misspelling or not. One J. Ziegemeier died as a child, the other is my gr-gr-grandfather.
My brother and I found a cemetary in Cass Co., IL where there is a woman married to an H. Ziegemeier, (my gr-grandfather had a twin brother named Henry) but he isn't buried there with her. I don't know the story to that. Her maiden name is Jockisch. So, I have another lead to follow to track down the Ziegemeier family line.