Alright, Pizza. I'm in.

The killer has a D in his name. Unlikely that it starts with a D too obvious. Pizza would never start with that as a clue. Martyr was killed for his communist tendancies so its likely the killers SN has something to do with ANTI-Communisim. Additionally the keyword CRACK should be noted.

I'll make no accusations or arrests just yet and wait to collect a few more clues.