I couldn't verify his death on-line but I didn't expect to find it since it was so early.
The County Clerk, co.gilliam.or.us/departments/clerk/index.html MIGHT have a copy if one was issued.
I'd contact Gilliam County Oregon Historical Society, www.rootsweb.com/~orgillia/HistoricalSociety.htm about a copy of his obituary. However one might not have been published. Successful Searching!