I'd look in Gem Co. first for his obituary. There is an obituary volunteer for this county at freepages.genealogy.rootsweb.ancestry.com/~obitl/volid.html
Scroll down to Gem Co. and choose Laura.
However, he might have died in Boise, Idaho. I think me might have gone to a bigger city for hospitalization. Laura is the obituary volunteer for Ada Co. too. Successful Searching!