Butcher was an excellent book and Carlo an exellent and well informed writer, but he is dead and Gangi in witness protection so we will probably never learn more about the goings on in the Just us lounge unless another guy spills more beans. With the high degree of Pitera's martial arts skills it is very likely that he killed with his hands. It was just never discussed. Sins of my father is a good book but nut nearly as good as Murder Machine