Very sad story. I grew up less than 15 minutes from where this happened. Murders of any kind were rare for that area, much less such a large scale tragedy.
According to all the stories that I have read about this, the gunman was never known (publicly) to be violent. We may never know if he had those tendencies behind closed doors, or if any signs had been exhibited to his family in the recent months since the break up of his marriage. For anyone that is experiencing any level of control/violence with regards to a break-up, please, please, please read
The Gift of Fear. It could save your life. It is hard to imagine that two entire families have been swept off the earth. Heartbreaking.
May all the victims of this senseless act rest in peace. Prayers for the many friends, extended family, members of Tri Delta, and those in the community that they left behind.