Hmm...well, I think I had his DNA degenerate once. He tried to make himself more super than Superman, and his body couldn't withstand the effects. Not a very fun way to go.

I believe there's a hero in all of us that keeps us honest, gives us strength, makes us noble, and finally allows us to die with pride, even though sometimes we have to be steady and give up the thing we want the most. Even our dreams. -- Aunt May, Spider-Man 2