I've been looking at a lot of cases; it's fascinating ...
I'll be linking to studies, profiles, and things I read here ...

To start you off, here's:

A Study Of Sexual Serial Killers
This one is about "signatures and rituals ...
What exactly are they?
How do they tie in to other crimes from an offender?
What is the actual frequency in which they occur; and why?

It's an interesting read ...
I'll post more as I read them ...

I posted these out of order ...
What Are The Different Types Of Serial Killers

My kid is a Cereal killer, I have to buy that shit all the time.

Ahhh ...
But what type?