Who is Arturo Genosa from Blood Rites and what is their importance?

Arturo is the adult film producer that Harry agrees to help. Arturo has women around him dying although Harry does not know why. It is not until Harry learns that Arturo is engaged to be married that Harry realizes it is Arturo's ex-wives behind the murders. One of the ex-wives is sacrificed during one of the rituals by another of the ex-wives and a second wife is killed by Lord Raith. Lord Raith is responsible for teaching the women. Arturo never learns the truth since those around him believe he would think himself responsible.