It's been all over the news and you can read it Here
This is silly, messed up kid plays game, gives him ideas and he kills. Parent knowing he was troubled should not have let him play a game that was rated as not suitable for him because of it's graphic violence anyway.
Then take LAN Parties. Probably twenty guys all in a confined space, it's hot, there are flashing lights, noisy music, blood curdling screams, people shouting at one another, very violent games being played, the testosterone is pumping and yet it's the friendliest atmosphere you are ever likely to get as a gamer.
I am not blaming his parent for the kids death, but I do feel parents in general need to consider the consequences of that media they are exposing their kids to.