speaking of how the killer can be the kid next door reminds of a story my dad used to tell about his growing up in Memphis, TN during the depression.
when he was a teenager, a new neighbor moved in the house next door. He would play sports with my dad and his brothers. my Grandpa remarked what a nice young man he was.
One day, my Grandpa came home from work(he was a railroad conductor, so he worked odd hours) and found the nice young man handcuffed in the back seat of a car. He was asked a well dressed who appeared to be guarding the car what was going on. "I'm with the FBI and this nice young man is Machine Gun Kelly" was the reply.