After visiting the nearby "Easy Chair" cache, I was inspired to visit some of the other former home sites in this area. (I believe they were cleared via Eminent Domain in the 1970's or 1980's).
As I was poking around this particular area, I spotted a wooden cross some distance away. Upon further investigation, I found Oscar's final resting place.
There's a clear trail to this site if you leave Barlow Road at N 37° 09.688 W 121° 53.372