I think Avery is my father's great uncle. I have been trying to find anything out about the Keyes family (which is also spelled Keys--my great grandmother's gravestone uses that spelling). I was shocked to see "Uncle Avery"'s name connected with a murder...I didn't know about it, and I am so sorry. My grandfather was murdered that same year (Walter Parsons) in Pineville by a first cousin. Rough times.
I discovered a WHOLE LOT about my grandfather's murder by going to EKU's library and searching out the newspapers on microfilm. I was able to copy articles that were printed in the papers as far away as Lexington. It was interesting to get the original take on the circumstances. If you're able to get to any KY libraries (college libraries tend to have most), you are likely to find the articles on Garrett's murder. You will need some dates, though, or it will be like the old needle in a haystack.
Let me know if you find anything. I'd be interested, since it seems my family was involved. Again, I am sorry for the affect all that must have had on your family.
--Susan Parsons Sumner