This I find extremely disturbing...and may be the reason for NP's death.
Only four days ago, MM posted on his FetLife account that he is into:
Kidnapping/Ravishment & Possession/Sexual Slavery. 4 days ago
He would have made that post on New Years Eve.
Warning - For those going to his page, there is nudity and vile subject matter. Reader Discretion is Advised.
Added - From just a quick read, TB and MM were a couple, at least in a sexual manner. He has a long letter titled, A Perfect Match, that is for and about her. He also lists himself as a "Daddy" to TB. This all explains a lot. I'm really leaning towards a sexual crime in my opinion.