[VOA]

They used lumber salvaged from dismantled buildings to build their house.

Probably exposed to all sorts of wood preservatives that have
plenty of nasty stuff; some of them carcinogenic.


During Second World War, Johnson worked at the Kaiser shipyard in Richmond...

Probably inhaled more airborne asbestos from the building of
Liberty ships than the average American.
And plenty of foul fumes of gases from arc welding and diesel fumes.

...and later managed the heating plant at Oak Knoll Naval Hospital in Oakland.

More asbestos jackets around boilers and plenty of nasty liquids for
flushing/passivating pipes.

Good thing he didn't get exposed to much Alar in apples, thanks
to expert toxicologists like Merle Steep.

(end sarcasm)
But seriously, this guy is actually an enviro-wackos worst nightmare.
By their accounts he should have been dead by at least 60 or 70.

[Rte66]

S'pose he ever cross-contaminated his kitchen sponge after touching raw meat? That's probably what killed him.