Bruce, Keith, Gay & Homer--
Thank you all for your excellent input in trying to solve our old family murder mystery. Your information is greatly appreciated. It's very frustrating because I know it happened, but can't find written proof.
My next step will be to try to track down the source where I read about this incident. I came across it quite by accident back in the late 70s or early 80s when I was at the Clayton Genealogy Library in Houston. I seem to recall that it was a thick book (perhaps even one of a multi-volumn series) that had announcements and death notices from various MO newspapers, or maybe it was just from a large city newspaper, like St. Louis. If not that, then it was one of the genealogy society quarterlies. I no longer live in Houston, but I will definitely let everyone know when I track down this old source.