The roommate of a slain University of South Florida doctoral student was charged with murder on Saturday as the search continues for another missing student. Hisham Abugharbieh, 26, was charged with two counts of murder in the first degree with a weapon in the death of USF students Zamil Limon and Nahida Bristy, according to the Hillsborough County Sheriff’s Office. Abugharbieh and Limon were roommates. Abugharbieh was arrested on Friday after authorities found Limon's body on the Howard