I enjoy writing and do you have any recommendations on true crime authors?

I'm preparing on writing several manuscripts about people just up and vanishing in thin air. I know I can't be the only one who finds it absolutely horrific. How do people not deemed murdered, not officially abducted, but end up missing in cold case files? In my heart of hearts, I am motivated by that alone to craft manuscripts of these cases to be published for the sake of public awareness. It's not a natural occurrence. It definitely shouldn't become the "norm".
I figured I'd use my skills to shed light on such cases, not just in writing; my skills include security, investigating, analytical thinking and the like. On that, I feel I can truly become a watchdog for these things. It will take time, so as practice, it would be good to read about other authors that fill in this role. So...any recommendations?