Hi, You can request a copy of his obituary (if one was published) from one of the obituary volunteers at Random Acts Genealogical Kindness. Go to raogk.org Click on Washington Click on K Scroll down to King Co. and choose ONE volunteer.
Contact the Seattle Genealogical Society, rootsweb.ancestry.com/~waseags/ . They do research for a fee. Ask them to look up the Seattle Directories to hopefully find more info about him. Successful Searching!