There are a couple of documentaries I've watched recently. One is older, Bill Curtis' Investigative Report, and Netflix has a much more updated doc that was just released. I highly recommend both if you are interested.

It was of interest to me because I know that area well and I lived there when I first watched UM and got into true crime. But it leaves me wondering how many serial killers roamed that area back then. Edward Harold Bell allegedly confessed to some murders in that area and there was segment on UM where a guy, last name 'Self' perhaps falsely confessed to murders in that area and I think he died in prison.