My mother went through the same thing. It's a hard hard thing to watch. I remember sitting with her on the front porch talking one day and she seemed together that day. I was thinking, "she's having a good day today". Then she asked me if I knew her son Jamie. I then realized that she didn't even know who she was sitting on the porch with. I don't wish death on anyone, but it's tough to watch someone go on that has already mentally checked out. But they don't realize it. It's the ones close to them that it really hits.