I just found this community. I've been fascinated by true crime as long as I can remember. I don't know what cases you've posted about, but i have several books on the subject and every so often I'm going to throw out a name you may or may not have heard of. Just someone or several someones you can look into if you're interested.
First I'll start with Dr. Hermann Webster Mudgett. AKA H.H. Holmes. He built a hotel during the World Exposition in Chicago 1894. He built in secret rooms to use for dismembering the bodies of guests, almost always young women.He also murdered the family of his swindling partner , Benjamin Pitzel.
Holmes admitted to 20 to 27 murders, but official estimates range from 40 to 100.
Keep your doors locked.