A man who gave his troubled son the rifle he used to kill four people at a Georgia high school was sentenced to 15 years in prison, the culmination of the state

A man who gave his troubled son the rifle he used to kill four people at a Georgia high school was sentenced to 15 years in prison, the culmination of the state's first case in which a parent was convicted for a mass shooting committed by his child [▻](https://video.twimg…