M.,
This is awful. I am so sorry for this loss.
We lost a close family friend, a child, to cancer, and it was and continues to be traumatic and sad. The guidance counselor at our school was very helpful with our daughter. Also, my daughter, who was 6 at the time, wrote constantly about the friend--poems, stories, etc.--which was great. If your child likes to write or draw, I would encourage her to write or draw about this friend.
As for the classmate dying of the choking game, also known as the fainting game...which is NOT a game...I think your school district is doing a real disservice by telling the kids that he died from an accident, without going further. The choking game is a way kids try to get high.
About 2 yrs ago, a boy in a neighboring school district died from the choking game. Our school district sent home (and e-mailed) a terrific letter to every family in the school district, explaining the choking game, and suggesting how to speak to our kids about it, and, as I recall, giving resources. I have a 9 yr old, and if this were his classmate who died, I certainly would talk to my child about the dangers of the choking game, and how children should tell an adult if anyone ever suggests the choking game...and how it is NOT a game. Some of these kids do this in a group, peer pressure situation, and some do it alone.
Reading this very sad post...well, I am going to talk to my kids about the choking game again today, as it has been a while, and it never hurts to reiterate these important things.
I just looked it up for some resources; signs of kids playing the choking game are listed. Here are a few sites:
http://www.stop-the-choking-game.com/en/home.html
http://well.blogs.nytimes.com/2008/02/14/choking-game-dea...
http://en.wikipedia.org/wiki/Choking_game
If I were in your shoes, I would go to the school district and, well, basically demand that they deal head on with how this child died...not necessarily today, but in a week or the like, so that the children are educated about what NOT to do. I had not heard of this "game" until the child in the neighboring township died "playing" it, and I was so thankful that our school district dealt with this educationally.
Good luck, and I am saddened by this family's loss.