USF students demand justice, increased safety following murders of Zamil Limon and Nahida Bristy

Murder Suspect Allegedly Asked ChatGPT How to Dump Bodies in Zamil Limon, Nahida Bristy Case

Investigators found evidence of blood inside the apartment Hisham Abugharbieh shared with Zamil Limon and suspicious items belonging to the missing students Nahida Bristy and Limon inside a trash compactor, according to court records.

Florida man accused of killing his roommate and friend allegedly used ChatGPT to ask about putting a body in a dumpster days before the two disappeared.

Hisham Abugharbieh is now facing multiple charges—including two counts of first degree murder with a weapon—in connection to the deaths of missing doctoral students Zamil Limon and Nahida Bristy, both 27, according to a statement from the Hillsborough County Sheriff’s Office.

Authorities launched a massive search effort to find Limon and Bristy after the pair disappeared April 16. More than a week later, Abugharbieh was determined to be a “person of interest” in the disappearances and taken into custody peacefully April 24 following a standoff with law enforcement at a Hillsborough County home, the sheriff’s office said.

That same day, Limon’s nude body was discovered along the Howard Frankland Bridge, according to court records obtained by the Tampa Bay Times. He had been stabbed multiple times, the outlet reported.

The Hillsborough County Sheriff’s Office discovered a second set of human remains in the waterways in the area of Interstate 275 and 4th Street North on April 26, according to a statement released by the department, but it’s unclear whether that discovery is connected to the case.

Hillsborough County Sheriff’s Office Public Relations Coordinator Brittany Muller told Oxygen.com the morning of April 27 that the remains had still not been identified, adding, “to protect the integrity of the investigation, we will not comment further than what has been released.”

Zamil Limon and Nahida S. Bristy

Photo: University of South Florida Police Department

ChatGPT Searches Discovered on Hisham Abugharbieh’s Phone

Investigators are now releasing more information about what led them to arrest Abugharbieh.

According to the court records obtained by Tampa Bay Times, three days before Limon and Bristy disappeared, Abugharbieh allegedly used Chat GPT to ask about placing a human into a dumpster. When the AI tool replied that “it sounds dangerous,” Abugharbieh asked, “How would they find out?”

Then, just a day before the doctoral students vanished, Abugharbieh asked, “Can a VIN number on a car be changed?” and “Can you keep a gun at home without a license,” per the records.

Authorities noted other suspicious searches were conducted through ChatGPT in the days after the students disappeared. According to the court records, Abugharbieh asked April 19, “Has there been someone who survived a sniper bullet to the head?” as well as “Will my neighbors hear my gun?”

Blood, Duct Tape, Missing Phone Case Discovered in Missing Person Probe

Investigators also found evidence to suggest that Abugharbieh drove across the Courtney Campbell Causeway to Sand Key Park the night of April 16 with video footage showing a Hyundai matching his vehicle in the area. Limon’s cell phone also last pinged in the same area that night before the signal dropped.

Abugharbieh—who had a cut on his left pinky finger when he talked to detectives—insisted the two had not been in his car and told investigators that he had nothing to do with their disappearances, according to the court documents. He told authorities that he had been in the area that night to check out possible fishing locations. Later, he allegedly admitted to driving Limon to the location, per the court records, but told authorities he’d just dropped his roommate off and then left.

Hisham Abugharbieh

Photo: Hillsborough County Sheriff’s Office

Not far from the apartment Limon and Abugharbieh shared investigators discovered a CVS receipt in a dumpster, with a time stamp of 10:47 p.m. on April 16, for trash bags, Lysol wipes, Febreze, Funyons and Irish Springs body wash. Although Abugharbieh denied making the purchase, investigators found a DoorDash order on his phone for the items, per the court records.

Investigators also uncovered silver duct tape, which tested positive for blood.

Inside Limon’s bedroom in the apartment, they found Bristy’s purse and USF identification card, sneakers and an umbrella she was seen carrying in surveillance footage showing her leaving the campus that day, according to The Tampa Bay Times.

Limon’s wallet, glasses and Bristy’s iPhone case were all discovered inside a trash compactor, authorities said in the documents. In addition, investigators found blood-stained clothing and a kitchen floor mat that had been missing from the apartment.

Inside Abugharbieh’s bedroom, forensic analysis revealed two “relatively human-sized” spots on the carpet that tested positive for blood through chemical testing, according to the court records. Authorities also discovered trash bags and duct tape under Abugharbieh’s bed.

Abugharbieh is currently being held without bond, according to Fox 13.  His pre-trial hearing is scheduled for April 28. It’s unclear whether he has retained an attorney.

As investigators pieced together the final days of Zamil Limon and Nahida Sultana Bristy, new accounts from those close to the suspect have added disturbing context to an already chilling case. An acquaintance of Hisham Saleh Abugharbieh, the 26-year-old roommate charged with the double murder, revealed that Abugharbieh repeatedly mentioned that Zamil Limon “was under a lot of pressure lately.” This narrative, according to the acquaintance, was offered casually in conversations before the students vanished on April 16, 2026. When police later searched the shared off-campus apartment, they found a notebook belonging to Limon with two pages torn out — a detail that has fueled speculation about possible attempts to remove incriminating or personal information related to the strained relationship with Abugharbieh.

These revelations build on earlier reports of subtle distress signals from the victims. A classmate said Limon appeared visibly worried and confided that he “had something to take care of tonight.” A close friend of Bristy reported receiving a final text message from her that ended with a short sentence drawing attention to Abugharbieh. Together, these elements suggest mounting tensions in the household that may have escalated fatally.

The Narrative of “Pressure”

The acquaintance, who spoke to investigators but has not been publicly named, described Abugharbieh as someone who often brought up Limon’s supposed stress levels. Abugharbieh allegedly portrayed Limon as overwhelmed by doctoral research demands, personal life, and the pressures of being an international student far from family in Bangladesh. This framing, offered proactively before anyone suspected foul play, now reads to some as an attempt to plant an alternative explanation — perhaps suicide, voluntary disappearance, or emotional breakdown — should questions arise.

Friends and family of Limon have pushed back strongly against this portrayal. Those who knew him described the 27-year-old geography, environmental science, and policy doctoral student as dedicated, focused, and passionate about his work using generative AI to analyze Florida’s shrinking wetlands. He was not known for cracking under academic pressure; instead, he was seen as methodical and resilient. Limon and Bristy, also 27 and pursuing a doctorate in chemical engineering, were considering marriage and maintained a supportive relationship that did not interfere with their studies.

The suggestion that Limon was “under a lot of pressure” contrasts sharply with accounts from his academic circle. His graduate advisor and peers remembered him as reliable and engaged. A GoFundMe established to support the families highlights the community’s shock at the violent end to two promising academic journeys.

The Notebook with Torn Pages

During the search of the Avalon Heights Boulevard apartment, investigators discovered a notebook linked to Zamil Limon that had two pages torn out. The exact contents of the missing pages remain undisclosed due to the active prosecution, but their removal has drawn significant attention. In the context of the case, it raises questions: Did Limon tear them out himself, perhaps to document or remove sensitive notes? Or were they removed by someone else after the alleged crime to eliminate evidence of conflict?

The notebook’s discovery ties into broader evidence of interpersonal strain. Roughly two weeks before April 16, Limon and another roommate reportedly filed a complaint against Abugharbieh after learning details of his background. One account described concerns over Abugharbieh’s behavior as troubling or “psychopathic.” A triplicate note found in Limon’s backpack — carbon-copy style paperwork — has also been scrutinized as potential documentation of formal issues or planned discussions.

The torn pages add to a pattern of possible evidence tampering or concealment. Prosecutors allege Abugharbieh took deliberate steps to sanitize the scene, including the purchase of cleaning supplies and heavy-duty trash bags on the day of the disappearance (per a CVS receipt).

Timeline of Tragedy and Cover-Up Allegations

Limon was last seen around 9 a.m. on April 16 at the apartment. Bristy was spotted about an hour later near a science building on the USF Tampa campus. Both stopped responding to messages. A family friend reported them missing on April 17.

On April 24, human remains in advanced decomposition were found in a black heavy-duty trash bag along the northbound Howard Frankland Bridge over Tampa Bay. The remains were identified as Limon. The Pinellas County Medical Examiner ruled the death a homicide caused by “multiple sharp force injuries.” Additional remains recovered in a waterway south of the bridge are believed connected to Bristy, though her identification and full recovery details continue as part of the active investigation.

Hisham Saleh Abugharbieh was arrested following a domestic violence call and brief standoff at a nearby residence. He faces two counts of first-degree premeditated murder with a weapon, plus charges including tampering with physical evidence, unlawfully moving a dead body, failure to report a death, false imprisonment, and battery. He is being held without bond.

Key evidence cited by prosecutors includes:

Blood evidence in the kitchen and Abugharbieh’s bedroom.
Limon’s personal items (wallet, campus ID, credit card, eyeglasses) and blood-stained clothing found in a complex trash compactor.
Matching heavy-duty black trash bags discovered under Abugharbieh’s bed.
Phone location data and surveillance linking Abugharbieh’s vehicle to areas near where Limon’s phone last pinged and the bridge.
A bandaged left pinky finger on Abugharbieh, initially explained as a kitchen accident.

Most notably, court documents allege Abugharbieh queried ChatGPT days before the disappearance about disposing of a human body in a black garbage bag and throwing it in a dumpster, asking how authorities might detect it. The AI reportedly flagged the query as dangerous. He also allegedly searched about changing a vehicle VIN and keeping a gun without a license. On April 23, after the students were missing, he reportedly searched “What does missing endangered adult mean?”

The Strained Roommate Relationship

The emerging picture is one of a relationship that deteriorated enough for formal complaints. Abugharbieh, who had previously been enrolled at USF but was not a current student at the time, lived in close quarters with Limon. The acquaintance’s account of him repeatedly emphasizing Limon’s “pressure” may now be viewed as deflection or an early attempt to shape the narrative.

Friends of the victims have described a tight-knit Bangladeshi student community at USF where Limon and Bristy were seen as positive, academically driven individuals. Their families, thousands of miles away, have expressed profound grief and called for the maximum punishment. Limon’s relatives and Bristy’s brother have spoken about missed warning signs and the need for better safeguards in student housing.

Broader Implications for Campus Life

This case has ignited discussions about roommate dynamics, especially for international students navigating new environments, shared housing, and mental health pressures. The combination of warning signs — a worried expression, a cryptic comment, a telling text message, a complaint, a triplicate note, and now a notebook with torn pages — highlights how distress can manifest subtly before escalating.

Universities are re-examining background checks for off-campus housing, response protocols for missing students, and support systems for those far from home. The alleged misuse of AI in planning (contrasted with Limon’s legitimate academic use of generative AI for environmental research) has added an unsettling contemporary layer.

As the investigation proceeds, forensic analysis of the apartment, digital devices, and additional witness statements continues. The torn pages from the notebook, like the other clues, may ultimately help reconstruct the events of April 16 and the nature of the relationship between victim and suspect.

For now, they stand as another haunting piece in a tragic puzzle: two dedicated scholars whose lives ended violently in the place they called home, while their roommate allegedly tried to control the story even before the alarm was raised.

The worried look on Limon’s face, Bristy’s final text, the triplicate note, and the notebook with missing pages collectively suggest that the victims may have sensed danger in their own living space — a space that should have been safe.