I wish I have a name and links to go with this but maybe, someone knows who I'm talking about.

I think I read it from a compilation book of serial killers. It was interesting because it was the first case where I read that real life experts got a race profile wrong.

A serial killer was on the loose in a middle class white neighbourhood. Nobody saw anything unusual on their streets. Profilers said they were looking for a white guy because he seemed to know and blend in with the neighbourhood. Surprise, surprise, it was a young black male. Nobody found him suspicious because he used to come around and help fix things.