New Hampshire doesn't publish their later death dates because those records are "closed" and restricted to those with a "Direct & Tangible Interest.
However you probably have enough info to find an obit and his last residence was Strafford, NH. I'd contact the Strafford Historical Society, http://strafhist.weebly.com/
. If they don't have obits, ask where you can find one. Successful Searching!