Horrible, horrible, unfortunate accident. Prayers for the poor victim and his family. It would appear that the farmer is very remorseful. Prayers for him that he may be able to live with his mistake.
Not an accident. Firing a weapon without determining the target or what is beyond it is negligence. Especially with a rifle. If he wants to scare birds he should use a shotgun with light shot or bird bombs.
I don't think you live with such a thing so much as die in stages because of it.