If you will go to http://www.usgennet.org/usa/ok/county/atoka/index.htmlhttp://www.usgennet.org/usa/ok/county/atoka/index.html you will find the names of the funeral homes listed around the middle of the page. It give you information on the holdings of the Atoka Funeral Home and I believe they date back to 1912.
You might wish to contact the Funeral Home. It is possible they might have a copy of the death record.
Ruth Atteberry Adams Atoka & Pushmataha Counties at USGennet.org