KEK, my condolences. It's sad to here stories like these. It just makes me realize how short, precious, and difficult life can be. We all have our skeletons in our closets and our demons to deal, unfortunately, for some it's just too much to handle. Keep your head up and try to think of the positives of your brother's life and all of his accomplishments. Like a previous poster stated before, he's in a better place, and if not, he's not tormented anymore.
My older brother got a divorce two years ago. He went from being a division one football player and being on top of the world to a drug addict. He got addicted to pills to the point where he was sniffing and injecting them and then got addicted big time into inhaling dust off. It was sad and after all the help my family and I offered, it never helped him. I kept thinking to myself that one day we were going to get a phone call from someone saying he was dead. He always blamed everyone, but himself for all of his demons he had on his back. One night he called me. He told me he couldn't do it anymore and he wanted to say his goodbye. He told me he was going to kill himself. I talked to him for a little while and eventually talked him into dinner and movie with me, on me. It wasn't much, but he accepted. I later did some research on suicide and to my surprise, most people who commit suicide don't talk about it or tell people. The ones who do, generally are the ones looking for help. People who commit suicide often show signs, but they are hard to follow and unpredictable. Like your brother, you may have thought that it was possible, but it's not like he told you. There was nothing you could have done to prevent it. My brother has since cleaned up thanks to his AA meetings and friends.
Your post was strong and I could feel your love for your brother. KEK, you're a good guy. You're in my prayers. Be strong.