I submit; dead by old age. I swear I didn't do anything to her. She's not hungry and didn't get attacked, though it is completely possible to get mauled to dead by hostile animals outside of my walls.
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hehehehe
In my ice sheet colony (I'm not nearly skilled enough to survive on an ice sheet yet without cheating) I will usually get visitors that freeze to death even with parkas, as well as I've had visitors attacked by man hunting boomalops (they actually seem to happen to me more often than wargs)... Let's say it wasn't pretty but it was funny to watch since the visitor where absolutely in chaos from the fire and explosions despite repeadly meleeing and close range shooting them