I love me some Investigation Discovery - just watched Deadly Sins last night, and I'll try and watch some more tonight. I'll cop to a morgue fascination with these kinds of things - I really enjoy reading about and listening to accounts of what certain killers did, why they did it, and lurid and often sexual details.
I will say Jared Remy in Deadly Sins' re-enactment is significantly better looking than the real version.
Likewise with Sheila LaBarre - while they did leave out some of the more horrifying details, the actress herself was both mind bogglingly beautiful and totally horrifying. Very good performance.
I must say I enjoy the sexed up depictions. There is a certain forbidden allure to it - you're not supposed to sex up murderers, serial killers and sociopaths...which is what makes it so very alluring and sometimes downright arousing to watch, for a sociopath.