Killed by a stingray? Bad luck there. Must have had an allergic reaction and no epinephrine in the med kit. I thought he'd been bit/stung/whatever enough that they'd know better. Getting poked by a stingray doesn't usually kill you.
Then again, knowing him he was probably holding the stingray up near his face and may have taken a load of venom in the face or chest. That would probably do it...
To be honest I'm suprised he lived this long, but not many people would even try half the stuff he got away with.
