Though it is always sad and frightening when someone takes their life, please don't let this interfere with your own recovery. What I mean is that it may well have had nothing to do with drink at all, or his sober time etc.
It is not a sign that sobriety isn't a worthy goal, or the program is faulty, none of us know what this man was dealing with in his personal life or inside his head.
Life is life, and it keeps happening sober or not.
We will see people die in the program and it does serve as a wake up call, as others have suggested, to address issues as they arise, but not to let ourselves feel defeated.