Dhaka, April 25 -- The body of a Bangladeshi doctoral student who went missing with his girlfriend from the University of South Florida was found on a bridge over Tampa Bay, and his roommate has been taken into custody, law enforcement authorities said Friday.

Zamil Limon's remains were found on the Howard Frankland bridge Friday morning, but Nahida Bristy is still missing, Hillsborough County Chief Deputy Joseph Maurer said.

Limon's roommate Hisham Saleh Abugharbeih, 26, was taken into custody at his family's home nearby on preliminary charges that include unlawfully moving a dead body, failure to report a death, tampering with evidence, false imprisonment and battery.

He was expected to make a first appearance in court on Saturday mo...