I would suggest having a necropsy done, to be sure--a few possibilities:
If the snake wasn't checked for them, internal parasites may have caused a hemorrhage in the digestive tract.
Likewise, the snake may have had lungworm.
The snake may have had some other parasite that traveled through the body where it shouldn't, and perforated the lung or intestinal tract.
The snake may have been injured in a freak accident while eating, and perforated its esophagus.
The snake may have had one of those rare events--some sort of embolism, bleed, etc in the lungs, which led to death.
There are probably other possibilities as well. I'm sorry you lost the snake--it can be very hard to lose an animal suddenly that way.
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