Stephen George Palmer d. Josephine Co. 11 Feb 1990 per death cert #90-02958, age=69, b. 6 Feb 1921; spouse=Leta. Source: OR Death Index. However, you won't be able to get a copy from the state until 2040 (they have a 50-yr rule).
I didn't find him in the 1930 Census and finding info after that is more difficult. I'd suggest contacting the Josephine County Hist. Soc, 512 SW Fifth St., Grants Pass, OR 97326, 541-479-7827. They probably will do research for a reasonable fee. Successful Hunting!