Hi Lois, A Jonathan Wills married Elizabeth A. Random 16 March 1859 by J. H. R. Royal, Minister, Clackamas Co. Witnesses: R. T. Wills and M. A. Lambert Source: "Early Marriage Records, Clackamas County Marriages, Abstracts". (book)
I didn't find anything on Jonathan's death either but the difficulty is that neither Washington or Oregon required any vital records that early.
You can contact the Clackamas County Family History Society, rootsweb.com/~genepool/ccfhs.htm about research on his death.
I'm assuming he died there because I couldn't find him in either state after 1870.
In 1870 he and family were living in Milwaukie, Clackamas Co., OR. Jonathan Wills b. IN, 27, carpenter. Mary, b. OR, 22. Grant, b. OR, 5. Ida, b. OR, 3. George, b. OR, 2. Successful Searching!