Also, I found the following links about Riley Willey. The first link, a page in a book freely available at Google Books, mentions his first wife Mary J. Vandever and his second wife Margaret J. Palmley (widow of W. D. Ingraham); the second link, Riley's death certificate, only mentions his second wife, who living at the time of his death:

http://books.google.com/books?id=Cn0UAAAAYAAJ&pg=PA609&a...

http://www.sos.mo.gov/TIF2PDFConsumer/DispPDF.aspx?fTiff=/ar...