http://nma.tv | http://www.nma.com.tw A British man has been accused in the grisly crossbow slaying of a prostitute and has been linked to the deaths of two others. Stephen Griffiths is described as a loner with an obsession with Jack the Ripper. He was also studying a PhD is criminology. Police say they found evidence on CCTV footage that Griffiths assaulted a woman and murdered her with a crossbow shot to the head. West Yorkshire Police are investigating whether Griffiths is tied to three murders in Bradford area.