What began as a routine missing persons case involving two dedicated University of South Florida (USF) doctoral students from Bangladesh took a sharp, forensic turn when investigators found a notebook in the off-campus apartment shared by Zamil Ahamed Limon and Hisham Saleh Abugharbieh. Inside, a single timestamp — a seemingly minor detail — dramatically altered the direction of the probe and helped solidify the case against Abugharbieh, now charged with two counts of first-degree premeditated murder with a weapon in the deaths of Limon, 27, and Nahida Bristy, 27.

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Limon’s remains were recovered on or near the Howard Frankland Bridge over Tampa Bay, while searches for Bristy continue in the waters below. The notebook discovery, combined with other anomalies at the Avalon Heights Boulevard apartment, has become a cornerstone of the timeline reconstruction that led to Abugharbieh’s swift arrest and escalating charges.

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The Notebook Timestamp: From Small Detail to Turning Point

On April 16, Limon was last seen around 9:00 a.m. at the shared apartment. He had casually told a friend he would “be back in 10 minutes.” Roughly one hour later, Bristy was sighted near the Natural & Environmental Sciences (NES) Building on the USF Tampa campus, carrying her backpack and leaving personal items (laptop, iPad, lunchbox) behind in a lab.

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Limon’s phone rang three times that morning before abruptly switching to voicemail — unusual behavior for someone known for always answering calls from family in Bangladesh. Both students’ phones soon went offline. Limon’s car remained parked in a campus lot for more than 14 hours with a charger still plugged into the dashboard, and the apartment door was found slightly ajar, something neighbors described as highly out of character.

When detectives searched the apartment, they discovered a notebook containing a timestamp that investigators say did not align with the known movements of the victims or the suspect. Such discrepancies in handwritten notes or logs can indicate staging, altered timelines, or attempts to document (or fabricate) events. The timestamp reportedly became a pivotal clue that helped detectives link Abugharbieh more directly to the sequence of events inside the residence during the critical 60-minute window between the students’ last known sightings.

This “small detail” joined other evidence: items collected in evidence bags from the kitchen counter, anomalies in phone activity (including a 19-minute gap), and forensic links from the bridge scene. Together, they shifted the investigation from a general missing persons inquiry to a targeted probe of the roommate.

The Arrest and Escalating Charges

On April 24, the same day Limon’s remains were identified on the Howard Frankland Bridge, deputies responded to a domestic violence call at a residence in the Lake Forest community linked to Abugharbieh. Family members were safely removed, but he barricaded himself inside for nearly 20 minutes before surrendering to SWAT while wearing only a towel.

Abugharbieh, a former USF student, had been interviewed at least twice as a person of interest and reportedly stopped cooperating in one session. Evidence gathered during and after the arrest, including material from the apartment notebook and the bridge, allowed detectives to link him directly to Limon’s remains. Authorities stated they believe he acted alone.

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Initial charges included 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 offenses. By April 25, these were upgraded to two counts of first-degree premeditated murder with a weapon in the deaths of Limon and Bristy. Abugharbieh is being held without bond at the Falkenburg Road Jail. An autopsy on Limon continues.

Two Promising Lives Cut Short

Zamil Limon and Nahida Bristy embodied the aspirations of international graduate students at USF. Limon pursued research in geography, environmental science, and policy with interests in AI applications. Bristy focused on chemical engineering. The pair were described as close, possibly in a relationship, and both maintained daily contact with families in Bangladesh, making the sudden silence especially alarming.

The case has deeply affected the USF community and the Bangladeshi diaspora. USF has offered counseling and support services while cooperating fully with law enforcement. It has also prompted discussions about safety in off-campus housing and the challenges faced by international scholars far from home.

Abugharbieh had prior legal history involving battery-related incidents and diversion programs, though officials have not publicly detailed a motive and caution against speculation. The notebook timestamp is believed to have provided key insight into timeline discrepancies or intent.

Ongoing Search for Nahida Bristy

As of April 26, Nahida Bristy’s whereabouts remain the focus of active searches, with marine and dive teams working near the Howard Frankland Bridge. The notebook, the unlocked apartment door, the stationary car with its plugged-in charger, and other forensic elements continue to inform the investigation.

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

What started as a “small detail” in a notebook has helped transform a missing persons case into a double-murder investigation. For the families in Bangladesh, the pain is profound, and the quest for full answers continues even as bodies are recovered.

The Howard Frankland Bridge now stands as more than infrastructure — it is part of a story marked by an unlocked door, a casual “back in 10 minutes,” and a timestamp that changed everything.

This article draws from official HCSO statements, press conferences, and reporting by multiple news outlets. Details such as the exact content or implications of the notebook timestamp, full forensic results, and 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.