This situation sounds VERY similar to a fairly recent church shooting where a man shot up the place because his wife had left him and he wanted to kill her and the people who were supporting her. Anyone recall that incident?
I believe that was a hair salon in Seal Beach CA, where the shooter was in a heated divorce with his wife and I believe there was a fight over kid custody. If I recall correctly, the shooter assumed some of the co-workers of the wife were egging her on against him. The husband walked in one day and simply shot everyone up then gave up.