The body of missing Northwestern graduate student Peter Salvino was pulled out of a Chicago harbor Tuesday evening, authorities say. The 25-year-old Ph.D student was last seen leaving a party on Sunday night. He had FaceTimed a friend to tell them he was walking home around that time, but when the friend called again at 12:37 a.m., he didn’t answer, police said. Salvino’s phone pinged at Diversey Harbor at 12:31 a.m., where his body was found. Chicago police are investigating the case.