States: Kansas: Coffey
Your post contains two items which appear to have taken you off the right track:
Your item << Died: September 1999 Independance, Montgomery County, Missouri >> probably refers to death in Independence, Kansas (rather than Independence, MO), as it is located in Montgomery County, Kansas. I don't even think there is a Montgomery County in Missouri, but if there is, I know that Independence is not in it. :-)
Your item << Diana Susan Kniffen June 18, 1949 Coffeevile, Kansas >> probably refers to Coffeyville, Kansas, which is located in Montgomery County, not far from Independence, Kansas.
I hope this info is helpful.