I've read all of this thread and watched the video. It is so terribly sad.
Many people do not realise how desperately ill and wretched an alcoholic can be. The poor guy was quite young and had tried rehab a few times without success. How depressing that is, I can almost feel the abyss that he saw. No wonder he didn't see any point in going on.
He was, however, quite capable of taking his own life. His brother says he wanted to spend time with loved ones, say goodbye properly, before dying. My view is he could have spent pleasant time with them, then written a letter, and done it himself. Employing a professional euthanasia outfit has so many implications.
I'm not advocating suicide btw but have empathy with the man. There but for fortune/grace of God, go I.