USF PhD murder case: roommate charged after body found

Two Bangladeshi University of South Florida doctoral students, Zamil Limon and Nahida Bristy, were reported missing in mid-April; Limon's body was later found on the Howard Frankland Bridge and his roommate has been charged in the killings, while Bristy's body remains missing. Bristy was a chemical engineering PhD student and Limon studied wetlands and environmental science; friends described them as promising researchers, and their families in Bangladesh await answers as investigators continue to probe the case.