On the morning of April 24, 2026, a domestic violence call in the Lake Forest community — just north of the University of South Florida (USF) Tampa campus — brought deputies to a residence tied to 26-year-old Hisham Saleh Abugharbieh (also spelled Abugharbeih). Family members were safely removed from the home, but Abugharbieh barricaded himself inside and refused to exit for approximately 20 minutes. When SWAT and crisis negotiators arrived, he eventually surrendered peacefully, stepping outside with his hands raised — wearing only a blue towel around his waist.

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That same morning, human remains discovered on the Howard Frankland Bridge were identified as those of Abugharbieh’s 27-year-old roommate, Zamil Ahamed Limon, a USF doctoral student. By the next day, Abugharbieh faced two counts of first-degree premeditated murder with a weapon in the deaths of Limon and 27-year-old Nahida Bristy, another USF doctoral student who remains missing. Authorities believe he acted alone.

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Hillsborough County Sheriff’s Office (HCSO) officials have indicated that events during the roughly 20-minute standoff — and the moments immediately surrounding Abugharbieh’s emergence — are now integrated into the broader investigative timeline. Evidence gathered at the residence, combined with the bridge discovery, helped solidify links in the case.

The Standoff in Context

Deputies responded around 9 a.m. to the domestic violence call at Abugharbieh’s family home. After securing the safety of relatives, they commanded him to come outside. He refused, leading to the deployment of SWAT, a drone, a robot, and crisis negotiators. Bodycam and released video footage show armored vehicles on scene as Abugharbieh finally exited with hands raised, shirtless, and wrapped in the towel. He was taken into custody without further incident and initially placed in a patrol vehicle still clad only in the towel.

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Prior to April 24, Abugharbieh — a former USF student — had been interviewed by detectives at least twice in connection with the disappearances of Limon and Bristy. He reportedly stopped cooperating during one session on April 23, the same day authorities upgraded the case from missing persons to endangered.

The timing of the standoff coincided with the recovery of Limon’s remains on the Howard Frankland Bridge, a major Interstate 275 span over Tampa Bay. Detectives stated that evidence from the arrest helped directly link Abugharbieh to Limon’s death.

The Disappearances: A Tight 60-Minute Window

Limon was last seen around 9:00 a.m. on April 16 leaving the off-campus apartment on Avalon Heights Boulevard that he shared with Abugharbieh. Phone logs showed his device ringing three times that morning before abruptly switching to voicemail — unusual for someone known for always answering calls from family in Bangladesh.

Roughly one hour later, at about 10:00 a.m., Nahida Bristy was spotted near the Natural & Environmental Sciences (NES) Building on the USF Tampa campus, reportedly carrying her backpack. She left behind personal items including her laptop, iPad, and lunchbox in a lab, suggesting she planned to return soon. Bristy did not live at the shared apartment but was described as close to Limon, possibly in a relationship.

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Both students maintained regular daily contact with loved ones overseas. When communication ceased, a family friend reported them missing on April 17. Phones for both soon went offline, complicating early searches.

Investigators have focused intensely on the approximately 60-minute gap between Limon’s last sighting at the apartment and Bristy’s on campus. Cross-referencing witness statements, cell tower data, surveillance, and digital forensics has made this window central to reconstructing events. Discrepancies in early sightings, including details around Bristy’s campus appearance, continue to be examined.

Charges and Ongoing Investigation

Abugharbieh was initially charged with offenses including unlawfully holding or moving a dead human body, failure to report a death with intent to conceal, tampering with physical evidence, false imprisonment, battery, and domestic violence-related counts. On April 25, these were upgraded to include two counts of first-degree premeditated murder with a weapon for the deaths of Limon and Bristy. He is being held without bond at the Falkenburg Road Jail.

An autopsy on Limon was underway, with results expected to clarify cause and manner of death. Dive teams continue searching Tampa Bay waters near the Howard Frankland Bridge for any sign of Bristy.

Lives Cut Short and Community Impact

Zamil Limon and Nahida Bristy were ambitious international doctoral students from Bangladesh. Limon focused on geography, environmental science, and policy, with interests in AI applications. Bristy pursued chemical engineering. Family and friends recalled their dedication and the emotional lifelines provided by daily calls home.

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The case has deeply affected the USF community and the Bangladeshi diaspora. USF has provided counseling and support services while cooperating with law enforcement. Discussions about safety in off-campus housing and the challenges faced by international graduate students have intensified.

Abugharbieh had prior legal history, including battery-related incidents and a diversion program, though officials have not publicly detailed a motive and urge caution against speculation.

As of April 26, the search for Nahida Bristy continues. HCSO marine units and divers remain active near the bridge. Anyone with information is urged to contact the Hillsborough County Sheriff’s Office at (813) 247-8200 or USF Police.

The roughly 20 minutes Abugharbieh spent inside the residence during the standoff — alongside the critical 60-minute window on April 16 — now form key segments of the investigative timeline. Digital evidence, forensic links, witness accounts, and physical items recovered are helping detectives piece together what authorities describe as a deeply disturbing case.

For the families in Bangladesh awaiting answers, the pain remains profound. The Howard Frankland Bridge, a routine commuter route, has become a somber landmark in a story of interrupted ambitions and severed connections.

The investigation is active, with potential for additional details or charges as forensic analysis and interviews proceed. Public tips could still prove vital, especially those shedding light on the events of April 16 or aiding the search for Bristy.

This report is based on official HCSO statements, press conferences, released video, and coverage from multiple news outlets. Details including full autopsy results, complete phone forensics, and any motive remain under active investigation and subject to update. Charges are allegations; Abugharbieh is presumed innocent until proven guilty in a court of law.