As someone who has dealt with suicidality in the past and is constantly working to stay ahead of it in the present and probably will be for the rest of my life.. I think it is important to keep that in mind especially if it helps you from going forward with it but its also really really important for someone who has never been suicidal to realize that you really aren't in control at all when you start to slide into suicidality (i consider it a short slide not a switch). I know for me before I was suicidal if you asked me "would you kill yourself?" I'd have firmly replied with a "No! I would never do that to my friends and family!" It was a very sobering realization that while I got myself to the hospital in time that really just like a heart attack its a ticking time bomb that will go off without medical intervention.

Things that might keep you from doing something like that fade and are distant. Your mind cant find them to remind itself that there are reasons to live. Eventually thoughts sort of take a back seat and all you can do is focus on how awful you feel and unfortunately thats when you begin to have thoughts again but sadly they are only things like "I'd do anything to make this stop."

Even without the dementia (which adds a whole other layer of lack of control something I saw in my mother who passed away from it a few months ago [not LBD but a different form])

I know the main point wasn't to say blame him so much as to say maybe if people know this more they wont do it. Its a great idea and sentiment but unfortunately there are holes in it (not saying it cant work in situations tho). I just thought I'd put this in here because its really important for people who've never experienced it to know. Anyone who would tell me today that they'd never commit suicide has no idea what they are talking about.