I am so sorry for your loss, I have a great understanding of how you feel. It will be two years this January 19th, that my brother attempted suicide. He has been in the hospital/nursing home most of the time. He is now in hospice, but they are giving him the boot, because he is not dying.
My brother has tube feedings, a diaper and a treche. He sleeps 22 hours out of 24. These last couple of years have been hell. He does recognize family, but his mind is back about 10 years most of the time.
What helps me is remembering who he was, all the fun times we had, all the laughter, our cedar point trip on his motorcycle. How incredibly smart he was, Professor/electronical engineer. He will be 42, in October.