I GOT SOME CHEMOTHERAPY

I got some chemotherapy and it made my bones so strong that they were were like indestructible ultra-lead pipes. When I died and all my flesh rotted away the bones remained gleaming and unbreakable. After the apocalypse, when the apes rose again, the ape that found my bones essentially had the nuclear weapons stash and became a brutal overlord over all other apes, keeping them in line with blows from my indestructible femur.