(TAMPA, Fla.) --  The remains of one of the two missing University of South Florida doctoral students were discovered by investigators Friday and his roommate was taken into custody, authorities said.

Joseph Maurer, of the Hillsborough County Sheriff's Office, told reporters that investigators found the remains of Zamil Limon on the Howard Frankland Bridge in Tampa Friday morning. Investigators have been searching for Limon and fellow USF doctoral student Nahida Bristy since they went missing on April 16.

Maurer said investigators received a 911 call for a domestic violence disturbance around 9 a.m. at a residence where Limon's roommate, Hisham Abugharbieh, had barricaded himself.

Abugharbieh, 26, was previously interviewed by police during their investigation into the disappearances, Mauer said.

Following a brief standoff, the suspect surrendered, Maurer said. He was seen exiting the home with nothing but a towel wrapped around his waist.

Abugharbieh was charged with unlawfully holding or move a dead human body in unapproved conditions, failure to report a death to the medical examiner or law enforcement (Intent to Conceal), tampering with physical evidence, false imprisonment and battery, the sheriff’s office said.

The cause of Limon's death is being determined, Maurer said. He had no further details about Bristy's condition.

Limon and Bristy, both 27, were last seen at separate locations in the Tampa area on April 16, according to the USF Police Department.

On Thursday, officials received new information to warrant upgrading their status from missing to endangered, which indicates they are at risk of physical injury or death, the Hillsborough County Sheriff's Office said.

The sheriff did not provide any more details about the investigation or search efforts.

Limon and Bristy are friends, and a mutual acquaintance reported them missing, campus police said.

Limon, who was pursuing a degree in geography, environmental science and policy, was last seen at his Tampa residence at approximately 9 a.m. on April 16, according to police.

Bristy, who is studying chemical engineering, was last seen at the USF Tampa campus at the Natural & Environmental Sciences Building at approximately 10 a.m. that day, police said.

Anyone with information on her whereabouts is urged to call the University of South Florida Police Department at 813-974-2628.

-ABC News' Meredith Deliso contributed to this report.

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