That is terrible news. My heart goes out to the father.
I looked the story up. It's all over the papers in Indiana. All of them are clear: the party included 2 adults and two youths. It was youth season. An adult shot the victim in the head.
There is obviously more to this than a simple accident.
Here's one of the links:
http://www.southbendtribune.com/news/sb ... 1310.story