Of course, it is hard to figure things out because the police have information we don't. I assume there must be a similarity between the writing on the tarot card(s) and the note?
This killer may be a lot of things but it is obvious he is not stupid. I can't believe that he would make a demand for money. This part of the story seems very strange.
Also, I'm sure I'm not the only one who thought that the people from the white van were not the suspect(s) because he wouldn't be that stupid. Although I did think it was possible that an accomplice (wanting OUT) left a note, but then I thought that anything publicized on that would mean death for that accomplice.