Doesn't sound like any of you could have picked up the signs. Doesn't sound at all premeditated. Perhaps when he went into the house he just became suddenly enraged; perhaps he was abusive in the past and you all didn't know it.
Or - perhaps she taunted him and he just snapped; then, horrified at what he had done, went home and killed himself.
No way of knowing. But a good lesson to discuss in the group the importance of getting treatment for depression symptoms, and to keep the focus more on GAL and moving forward, rather than ruminating on the loss.
