Piana died of Congenital Stoopidity. His casket was a hermetically sealed oil drum at least 10 miles from any tributary streams, drains or natural run offs that lead to lakes (got to protect O'Hearns duck egg supply), rivers and streams and ultimately, the ocean.
As his oil fill tissues break down it is estimated that in 3 million or so years Piana's carcass will be the world's largest supplier of oil. Black gold. Texas Tea. Sheeeeit!