It does not say that in this article but, he fired at something without visually verifying the target.
I am really not suprised that is all you took from this article, accidents happen!! Reminds me of a story I read about a teen lowering a loaded weapon from his treestand and it fired, killing his friend. One of the comments was " he got what he deserved for hunting defenseless animals".
So do you also think that he took his life to avoid prosecution? I'd say he was devastated by his action and knowed he could not live with the fact he killed a life long friend.
There are two families devastated over this unfortunate accident, whether avoidable or not!