Tampa Double Homicide Investigation: USF Doctoral Students’ Deaths Linked to Roommate’s Alleged AI Searches on Evidence Disposal

TAMPA, Fla. — The University of South Florida community is reeling after the deaths of two doctoral students, whose cases have taken a chilling turn with new evidence suggesting premeditation. Hisham Abugharbieh, 26, a roommate of one of the victims, now faces two counts of first-degree murder with a weapon in connection with the deaths of Zamil Limon and Nahida Bristy, both 27. While Limon’s remains were recovered last week, Bristy remains missing and authorities are pursuing leads that could shed light on her whereabouts.

The Timeline: From Disappearance to Arrest

Zamil Limon and Nahida Bristy were last seen in the Tampa area on April 16, 2026, according to the Hillsborough County Sheriff’s Office (HCSO). Their disappearances prompted an immediate search, with law enforcement elevating their status to “endangered” on April 23 after uncovering troubling new information. The following day, Limon’s remains were discovered on the Howard Frankland Bridge, a critical span connecting Tampa to St. Petersburg over Tampa Bay.

Investigators responded to a 911 call around 9 a.m. On April 24 reporting a domestic disturbance at a residence in the Lake Forest Community, near USF’s Tampa campus. Abugharbieh, who had been previously interviewed in connection with the disappearances, was found barricaded inside the home. After a brief standoff, he surrendered peacefully, emerging with only a towel wrapped around his waist, according to HCSO Chief Deputy Joseph Maurer.

Abugharbieh was taken into custody and charged with two counts of first-degree murder, along with additional charges including battery, false imprisonment, tampering with evidence, failure to report a death, and unlawfully moving a body. He made his first court appearance on April 25 and is being held without bond pending a detention hearing scheduled for April 28.

New Evidence Points to Premeditation

Prosecutors have revealed disturbing details about the case, including evidence that Abugharbieh conducted online searches related to disposing of bodies. According to court documents filed by the Hillsborough County State Attorney’s Office, investigators found that the suspect had used ChatGPT to research methods of evidence disposal, raising questions about the extent of his planning. The nature of these searches has intensified scrutiny on the case, with authorities treating it as a premeditated act.

Limon’s cause of death was determined to be “multiple sharp force injuries,” according to an autopsy report cited in court filings. Meanwhile, the search for Bristy continues, with dive teams scouring areas near the Howard Frankland Bridge. The HCSO has also issued a public appeal for dashcam footage from anyone who drove on the bridge between 1 a.m. And 5 a.m. On April 17, hoping to uncover additional clues.

The Victims: Promising Researchers Cut Short

Both victims were doctoral students at the University of South Florida, where they were pursuing advanced research in cutting-edge fields.

• Zamil Limon, originally from Bangladesh, was studying the intersection of artificial intelligence and environmental science. His family described him as a dedicated researcher who was set to present his doctoral thesis later this week. Limon’s work focused on using AI to model climate patterns and predict environmental changes, a field with significant implications for sustainability efforts.
• Nahida Bristy, also 27, was a chemical engineering doctoral candidate. Her brother, Zahid Pranto, told reporters that Bristy maintained daily contact with her family, making her sudden disappearance all the more alarming. “There has not been a single day without contact with her,” Pranto said. “My family is just devastated.”

Their deaths have sent shockwaves through the USF community, where students and faculty have organized vigils and support networks for the victims’ families. The university has also offered counseling services to those affected by the tragedy.

Legal Proceedings and Next Steps

Abugharbieh’s next court appearance is scheduled for April 28, 2026, where a judge will determine whether he will remain in custody pending trial. The Hillsborough County Public Defender’s Office has been appointed to represent him but has declined to comment on the specifics of the case, citing the defendant’s right to a fair trial.

Prosecutors have requested that Abugharbieh remain jailed without bond, citing the “gruesome nature” of the alleged crimes. The case has drawn comparisons to other high-profile homicides involving premeditation and digital evidence, underscoring the growing role of technology in criminal investigations.

How the Community Is Responding

The Tampa Bay area has rallied around the victims’ families, with local organizations and USF students organizing fundraisers to support the ongoing search for Bristy and cover funeral expenses for Limon. The university has also established a memorial fund in Limon’s name to support future students in environmental science and AI research.

“This is an unimaginable tragedy for our community,” said USF President Dr. Rhea Law in a statement. “Our thoughts are with the families of Zamil and Nahida, and we are committed to providing them with the support they need during this difficult time.”

Key Questions Surrounding the Case

What Happened to Nahida Bristy?

As of April 28, 2026, Nahida Bristy remains missing. Authorities have not released specific details about her potential whereabouts, but dive teams and search parties continue to focus on areas near the Howard Frankland Bridge. The HCSO has urged the public to report any suspicious activity or information that could aid in the investigation.

What Evidence Links Abugharbieh to the Crimes?

While the full scope of the evidence has not been disclosed, court documents indicate that Abugharbieh’s online activity—including searches related to evidence disposal—played a significant role in the investigation. His prior interview with police and the domestic disturbance call on April 24 have been cited as key factors in his arrest.

How Has USF Responded to the Tragedy?

The University of South Florida has taken several steps to support the victims’ families and the broader campus community. These include:

• Offering grief counseling and mental health resources to students, and faculty.
• Organizing vigils and memorial events to honor Limon and Bristy.
• Establishing a memorial fund in Limon’s name to support future research in AI and environmental science.
• Increasing campus security measures and collaborating with local law enforcement to ensure student safety.

What Are the Potential Legal Outcomes?

Abugharbieh faces two counts of first-degree murder, which carry a potential sentence of life in prison or the death penalty in Florida. The additional charges, including tampering with evidence and unlawfully moving a body, could result in further penalties if he is convicted. The case is expected to proceed through the Florida court system, with preliminary hearings likely to take place in the coming weeks.

Looking Ahead: The Search for Answers Continues

As the investigation into the deaths of Zamil Limon and Nahida Bristy unfolds, the Tampa Bay community remains focused on finding justice for the victims and supporting their families. The case has highlighted the importance of digital forensics in modern criminal investigations, as well as the need for vigilance in addressing domestic violence and missing persons cases.

For now, the search for Bristy continues, and authorities are urging anyone with information to come forward. The HCSO has set up a dedicated tip line at (813) 247-8200 and encourages the public to share any relevant details, no matter how small they may seem.

Key Takeaways

• Two USF doctoral students, Zamil Limon and Nahida Bristy, were reported missing on April 16, 2026. Limon’s remains were found on April 24 on the Howard Frankland Bridge; Bristy remains missing.
• Hisham Abugharbieh, 26, a roommate of Limon, has been charged with two counts of first-degree murder with a weapon. He faces additional charges, including tampering with evidence and unlawfully moving a body.
• New evidence suggests premeditation. Prosecutors allege Abugharbieh conducted online searches about disposing of bodies using ChatGPT.
• The victims were promising researchers. Limon was studying AI in environmental science, while Bristy was pursuing a Ph.D. In chemical engineering.
• The USF community has rallied to support the victims’ families. Vigils, fundraisers, and counseling services have been organized to help those affected by the tragedy.
• The search for Bristy is ongoing. Authorities are requesting dashcam footage from the Howard Frankland Bridge on April 17 and urging the public to report any tips.