Updated on: April 25, 2026 / 9:02 AM EDT / CBS News Add CBS News on Google A 26-year-old man is facing two counts of first-degree murder in the deaths of two University of South Florida doctoral students who went missing last week, local authorities said Saturday.  The Hillsborough County Sheriff's Office in Florida said that evidence presented to the state attorney's office resulted in the charges against Hisham Abugharbieh, the roommate of Zamil Limon, one of the doctoral students.  Abugharbieh is accused of premediated murder with a weapon. He was arrested on Friday , the same day Limon was found dead.  The family of Nahida Bristy, the other doctoral student, told CBS News that police said she is also likely dead. That is based on the volume of blood discovered at Abugharbieh's residence, which he shared with Limon. "Police told us she is no longer with us," Bristy's brother, Zahid Prato, said early Saturday.…