said what he did would be talked about for a long time. Since it was based on the seven deadly sins, Spacey said cutting off the detective's wife's head was his sin...envy. He was envious of the life that the detective had---he knew he was young and reactive----and would shoot him (Spacey). "Proper burial" is referenced in that movie.

I don't think they ever revealed who Spacey was, or where he came from---there were no records leading to him---including his fingerprints, because he had filed the padded parts of his fingertips.