Casting a love spell on someone is often viewed as a form of manipulation, which can lead to negative emotional or psychological consequences for both the caster and the target. While there's no scientific evidence to support the idea that such spells can directly cause illness or death, the emotional turmoil and stress resulting from obsessive or unreciprocated love can have serious effects on mental and physical health. Ultimately, ethical considerations suggest that attempting to control another person's feelings through magic is unhealthy and potentially harmful.
An illness that is able to cause death.
illness
She died from a unknown illness
If this person had a long illness, it would not be surprising to expect their death. Such an event would not ordinarily cause trauma. The death certainly could be cause for grief, which often includes dreams and troubled memories.
People with mental illness are just as susceptible to medical illness as any other human being. Causing the death of another human being, (if you are speaking of murder) does not, obviously, cause a person to get Alzheimer's.)
How about poisons
Aristotle died from an unidentified stomach illness.
She died from a unknown illness
microorganisms in it that can cause illness, diseases, and death.
Hamlisch died after a brief illness. Details of his death are not being released.
tetanus
If a persons immune system is weak, it can cause death.