DISCLAIMER: I am not a lawyer. This is not legal advice.
This is a nearly impossible to prove in court, unless she was appointed as his caretaker due to being unable to care for himself.
The major issue is that proving intent is impossible in your scenario and lying isn’t illegal. Nor is failing to set appointments or provide over-the-counter medicine if you haven’t been granted some form of guardianship.
You need to explain what prevented the husband from seeking his own medical care. If he was capable of seeking care and didn’t, even if she lied about the availability of the care, it will be very hard to prove that her intent was his death. You would need to prove that a) she told HIM that she had set up appointments etc or that they weren’t available, b) she knew that blocking him from getting treatment would likely lead to his death, and c) she actively interfered with his own attempts to seek care
The best you could hope for would be something like involuntary manslaughter, negligence, reckless disregard, or something like that
Answering YOUR question:
This is common with disposables and low-quality cartridges.
What’s happening: some of the “oil” (which is really more like wax) is getting pulled/dripping into the airflow channel, and when it dries between uses becomes too solid to be cleared easily, blocking airflow
To prevent it next time: don’t “chain vape”. Take one, maybe two hits tops and let it cool fully before using again
What to do with this one: You can’t really fix it unfortunately. So when you experience this, do quick, short, hard pulls repeatedly until it clears. You’re trying to activate the coil so it heats up the oil/wax until it’s soft enough that air pressure can clear the blockage temporarily. To save your cheeks, you can also suck on it hard, creating negative pressure, then, without letting go, block the hole with your tongue. This will create suction inside, and if you leave it like that for 10-15 seconds it should clear the clog temporarily.