The suspected gunman in the killing of an orthopedic surgeon in Tennessee is expected to be arraigned Thursday. Larry Pickens, 29, was charged with first-degree murder and aggravated assault for allegedly shooting and killing Dr. Benjamin Mauck while Mauk was treating him in an exam room. Police say the attack was targeted, but a motive remains unclear. Dale Lane, chief of police for the Collierville Police Department, joined CBS News to talk about the case. Source