About three months ago I got a call from the VA in Tucson.
My brother, who is a few years older than I am, and a vet, had been causing a
ruckus at his apartment house. Two nurses (VA) who were treating a wound that he
had (a cyst that wouldn't heal) heard him say he wanted to blow his brains out,
but first he would go to the office and shoot the apartment admins.
Apparently , he had a conflict about his rent payments. They called the cops.
The admins called me, I called him, etc. He was taken to the VA and tests
were done. He scored a 10 out of30 on a memory test. They took him into
"custody" and he is now in the dementia ward, basically locked up in jail.
He and I were never close, but I have been looking after him for a few years,
although it's difficult for me to travel to Tucson. I rented a truck and cleaned
out his apartment (two trips) and put his belongings in storage at my place, along with
all of the other stuff he had here.
He has a masters degree in history and a large collection of history books, some
old and valuable. I guess I will donate them to the library. He's unsure about
what's happening to him, but he's medicated and sure he'll be out soon.
He'll never be out.
We were never close, but I love him just the same. My mother's last words to me
were to "Look after your brother." There's nothing I can do now. Sad.
= new reply since forum marked as read
Your brother unfortunately is where he has to be, for his safety and others. You've done what you can for him. I hope you have family and/or friends you can lean on for support. 
