But what if the disease cause hallucinations and the person was acting upon the hallucination like you do in a dream. You may dream of killing yourself (and to many that is a nightmare) but in an awake state, you may never want to actually do it. So physically it is suicide. But can one claim that the person was aware that they were actually committing suicide in real life?
I remember when I was young a neighbor jumping out his 4th floor window. He was tripping on some drug and thought he could fly. Now, I would argue suicide by stupidity for taking the drug, but when a mental illness goes undiagnosed and the patient isn’t aware of it and does something foolish, should they be held accountable.
Let look at it another way. When someone commits murder by reason of insanity they are let off the hook in a way. They are put in a mental facility and given medications. Of course you can’t do that with dead people but I don’t get why insurance agencies get to keep money for a suicide if the person suffered from hallucinations and was not aware of being mentally ill.
It seems that through his life he tried to get help for all the diseases that he had and stayed on top of taking his medications. This does not sound like someone who has given up on life. He may not have been killed by the disease but he may have taken his own life because the disease affected his thinking.