Sad. Just very sad. I heard the audio of the 9/11 tape several times today. I think the man finally snapped. It's not just about the damn lawn, because I've occasionally had neighbors from hell. The parents might be asked some hard questions about why they allowed their son(and themselves) to harass a neighbor until it came to this.
There might be questions about the harrassment.
However, anyone who knows to buy slug rounds for a shotgun knows that he's shooting to kill.
This guy intended to kill that kid. Unless they find him insane, they'll have to find it premeditated, imo.