Hillsborough County authorities have confirmed the recovery of the bodies of both missing University of South Florida (USF) doctoral students: 27-year-old Zamil Ahamed Limon and 27-year-old Nahida Bristy. The grim discoveries bring closure to the search phase of a case that began with the pair vanishing on April 16, but open a new chapter centered on digital evidence — specifically a 19-minute gap in Limon’s phone activity that morning, which detectives believe may hold critical clues to the sequence of events and the suspect’s actions.

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Hisham Saleh Abugharbieh (also spelled Abugharbeih), 26, Limon’s roommate and a former USF student, faces two counts of first-degree premeditated murder with a weapon in the deaths of both victims. He was arrested on April 24 following a standoff at a family residence in North Tampa, where he barricaded himself for nearly 20 minutes before surrendering while wearing only a towel.

The 19-Minute Phone Gap: A Pivotal Clue

On the morning of April 16, Limon was last seen around 9:00 a.m. at the off-campus apartment on Avalon Heights Boulevard he shared with Abugharbieh. Phone logs previously revealed his device ringing three times before abruptly switching to voicemail — unusual for someone known for never ignoring calls from family in Bangladesh. Bristy was sighted roughly one hour later near the Natural & Environmental Sciences (NES) Building on the USF Tampa campus, carrying her backpack and leaving personal items (laptop, iPad, lunchbox) in a lab.

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Investigators are now highlighting a 19-minute gap in Limon’s phone activity during those critical early hours. Such gaps in digital forensics can indicate deliberate powering down, removal of the SIM card, airplane mode activation, or use by another person. Detectives suggest this window may align with key movements inside or near the apartment, potentially revealing how the situation escalated and why both students’ phones went offline shortly afterward. The gap is being cross-referenced with cell tower data, the stationary position of Limon’s car (which remained in a campus lot for over 14 hours with a charger still plugged in), the apartment door found slightly ajar (out of character for Limon), and items collected in evidence bags from the kitchen counter.

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Limon’s remains were initially located on or near the Howard Frankland Bridge. With both bodies now recovered, forensic teams are working to determine cause and manner of death, while the phone gap could help establish timeline precision and possible motive.

The Arrest and Investigative Momentum

Abugharbieh was taken into custody on April 24 after deputies responded to a domestic violence call at his family home. Family members were safely removed before he refused to exit for nearly 20 minutes. Evidence from the arrest and the bridge scene helped link him directly to Limon’s remains. Authorities have stated they believe he acted alone.

Charges were upgraded to two counts of first-degree premeditated murder with a weapon. Abugharbieh is being held without bond at the Falkenburg Road Jail. His prior legal history, including battery-related incidents, has been noted but not officially tied to motive.

Remembering the Victims

Zamil Limon and Nahida Bristy, both from Bangladesh, were dedicated doctoral candidates at USF. Limon studied geography, environmental science, and policy with a focus on AI applications. Bristy pursued chemical engineering. Described as close — possibly in a relationship and considering marriage — they maintained daily contact with families overseas, making the sudden silence deeply alarming.

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The case has shaken the USF community and the Bangladeshi diaspora. The university has offered counseling and support while cooperating fully with law enforcement. It has also highlighted challenges faced by international graduate students, including isolation in off-campus housing.

Ongoing Aspects of the Case

With both bodies recovered, the investigation shifts emphasis to full forensic analysis, digital reconstruction (including the 19-minute phone gap), witness statements, and any potential staging or cleanup efforts. The 60-minute window between the students’ last known sightings remains central, as do anomalies such as the unlocked apartment door and Limon’s idle car.

Anyone with information — particularly regarding phone activity, vehicle movements, or observations around the apartment or campus on April 16 — is urged to contact the Hillsborough County Sheriff’s Office at (813) 247-8200 or USF Police.

This tragedy, from two promising scholars disappearing within an hour to the recovery of both bodies and scrutiny of a narrow phone activity gap, has left many seeking answers. For the families in Bangladesh, the confirmation brings an end to uncertainty but begins the pursuit of full accountability.

This article draws from official HCSO statements, press conferences, and reporting by multiple news outlets. Details such as the precise nature of the phone gap, full forensic results from the bodies and devices, and any confirmed motive remain under active investigation and are subject to update. Charges are allegations; Abugharbieh is presumed innocent until proven guilty in a court of law.