Full Breakdown
Double Homicide of USF Doctoral Students: Investigation, Charges, and Ongoing Questions
5/3/2026, 9:49:58 AM
The Double Homicide of USF Doctoral Students
On April 16 2026, two University of South Florida doctoral candidates—Zamil Limon, a 27-year-old geography and environmental-science PhD student, and Nahida Bristy, a 27-year-old chemical-engineering PhD student, both from Bangladesh—disappeared after missing appointments. Limon’s body was found on April 24 in a black trash bag on the Howard Franklin Bridge; Bristy’s remains were recovered on April 26 in a mangrove bag near I-275. Both suffered multiple stab wounds; Limon was bound and his legs partially severed to fit the bag. Hisham Abugharbieh, Limon’s 26-year-old former roommate, was arrested and charged with two counts of first-degree pre-meditated murder with a weapon.
Timeline of Key Events
- April 16: Limon and Bristy last seen; missing reports filed next day.
- April 24 (6 a.m.): Limon’s body recovered; Abugharbieh arrested after a domestic-violence call.
- April 26: Kayakers locate Bristy’s bag; DNA confirms identity.
- May 1: Sheriff announces both identifications and formal charges.
Investigation Findings
Forensic analysis uncovered extensive blood in the Avalon Heights kitchen, hallway and Abugharbieh’s bedroom, including a luminol outline of a body near his bed. Blood matching Bristy was also found in his car. Purchases included black contractor bags, duct tape, lighter fluid and a lighter. Searches included “Can a knife penetrate a skull?” and “Can you bury a body in a trash bag and throw it in a dumpster?” He asked ChatGPT how to dispose of a body; it replied the scenario “sounds dangerous,” and he asked, “How would they find out?” DNA, dental records and clothing confirmed the victims’ identities.
Official Statements & Legal Context
Sheriff Chronister called the killings “gruesome” and “pure evil,” said the bodies will be returned to Bangladesh for religious rites, and pledged to find a motive. USF President Moez Limayem expressed “profound sadness” and announced a support fund. Attorney General James Uthmeier opened a probe into OpenAI after learning the suspect used ChatGPT. Critics cite the suspect’s domestic-violence history and warn about AI misuse.
Conflicting Reports & Gaps
Some outlets report Bristy’s cause of death as multiple stab wounds, while others have not disclosed it. Identification dates vary between April 30 and May 1. The exact wording of the ChatGPT exchange differs across sources. A motive remains undetermined.
Verbatim Quotes
- “The details of this investigation are gruesome, and the actions of the suspect are nothing short of pure evil,” — Chad Chronister, Hillsborough County Sheriff
- “We have located Nahida Bristy,” — Chad Chronister, Hillsborough County Sheriff
- “This is someone very calculated,” — Chad Chronister, Hillsborough County Sheriff
- “ When the chatbot responded that the scenario sounded dangerous, he allegedly replied, “How would they find out.” — Chad Chronister, Hillsborough County Sheriff
What’s Next
A grand-jury hearing is scheduled for next week, and prosecutors are weighing the death-penalty option. The bodies will be repatriated to Bangladesh for burial. Investigators continue to seek a motive and to evaluate potential regulation of AI tools used in criminal planning.
