Hi L L, I found a couple of Family Trees on Ancestry that contain your family. I asked all of them to contact you.
An Annie Keliehor died 18 March 1931, Jackson Co., Oregon. Source: Oregon Death Index 1903-98.
You can verify this by requesting a copy of her obituary from a volunteer at Random Acts Genealogical Kindness. Go to raogk.org, read guidelines, choose Oregon, choose Jackson Co. and choose one volunteer.
Also the Jackson County Library does lookup obituaries too, jcls.org/db-genealogy.html . Successful Searching!
The Bobby Denson and Alice Conaway Family Tree also shows that William Sr. died 20 Aug 1923, Santa Clara Co., California.
I'd request a copy of his obituary too from RAOGK. When you get to the County, click on ALL and choose Brenda.
I didn't find the censuses you were looking for.
I did find on one of these Family Trees that the Keliehor's were Catholic. That might explain why William and Annie were living apart and still married at the end of their lives.