BLACKSBURG, Va. (AP) _ A prosecutor says the preliminary hearing for two former Virginia Tech students charged in the slaying of a 13-year-old girl has been postponed. The hearing originally was set for Monday in Montgomery County Juvenile and Domestic Relations Court. A new date has not been set. Prosecutor Mary Pettitt said in an email Wednesday that defense attorneys needed more time to prepare, and her office has not received the final medical examiner’s report on Nicole Lovell. Eighteen-year-old David Eisenhauer of Columbia, Maryland, is charged with abduction and first-degree murder in Nicole’s late January death. Nineteen-year-old Natalie Keepers of Laurel, Maryland, is charged with accessory before and after the fact and with illegally dumping Nicole’s body just across the state line in North Carolina.