The best account I have read so far of the actual events of the shooting was this one in The Guardian.
We in Boulder are particularly shocked and disturbed because the event happened nearby, and because ours too is an academic community. I suspect a lot of educators are wondering whether they’re doing enough to monitor the well-being of their students and to foster a sense of community among them. Seems it’s always the loner, the one who “kind of stuck to himself,” that we need to worry about. Latest reports also indicate that drugs and alcohol may have been involved as well.
So much has been written and said, and so profoundly, that I see no need to add to the chorus here. Feel free to comment if you wish, though.