The Boston cop killer, previously known as Terrell Muhammad, is still living a life of crime. The career criminal, who changed his name to Joshua McCullough, was arrested this week for assaulting and robbing a woman in Rhode Island. McCullough killed a Boston Police officer in 1993, was sentenced to 26-30 years for the murder and only served 15 before being released. We discussed how this criminal has had one too many chances…