As the title says, a guy drives up in a picturesque neighborhood, all of this I’m pretty sure about, the grass is all bright green and perfectly manicured. White picket fences etc. The guy drives up in a yellow car, again I think. There’s a woman in a house, also yellow, and the guy gets out and kicks v the door open and blows her away with the shotgun. He’s mumbling something before he shoots her. He then goes to a neighboring house and goes after the mother their and I don’t remember what happened after that, he mightve killed himself? I think after that it fast forwards to present day and some detectives are talking about the man and why the case had never been solved.

I might be mixing a few movies up here, but the one I’m sure of is the guy shooting all the people in the neighborhood.