First off thanks for all the thoughts.
I think I might not have been clear enough in my explanation though:
The condition needs to be a pre-existing condition: such as: asthma, diabetes, etc... But it can't be something that anybody would die of any time soon... So diabetes can kill but that's years down the road.
The condition needs to require regular treatment: such as insulin injections, inhaler, or a pill/medication.
Therefore when the treatment runs out because they are trapped it causes death. Therefore it was the being trapped that killed them.
Although strokes and heart attacks are certainly ways to die it requires another outside force to trigger it. And it would have a good chance of killing them whether they were trapped or not. Meaning it's an independent event. Being trapped and running out of treatment is entirely depending on the trapping.
A peanut spills is definitely interesting but again it the idea of it's another independent event. The events can't be independent.