A fourth arrest has landed in one of Jacksonville's most calculated gang murders in recent memory — a $20,000 bounty that killed its intended target and the Uber driver who happened to be behind the wheel. Jacksonville Sheriff's Office detectives say 31-year-old Jamaal Hameen was taken into custody nearly three years after gunfire tore through a Northside neighborhood, ending the lives of 19-year-old Antonio Tillie Jr. and 31-year-old rideshare driver Bryant Grund.
Hameen was already sitting in jail on unrelated charges when investigators moved to add two counts of second-degree murder and one count of accessory after the fact to his record, according to News4JAX. His arrest follows those of three co-defendants already moving through the court system: shooter Ju'Quan Mills, lookout and getaway driver Jimmy Robinson, and Diamond Harris, the woman accused of luring Tillie to the ambush site.
A Late-Night Ambush on Kylan Drive
The violence unfolded around 11:45 p.m. on October 6, 2023, when Jacksonville Sheriff's Office officers responding to reports of gunfire found a Mini Cooper Clubvan crashed into a home on the 7440 block of Kylan Drive West, according to First Coast News. Grund was found dead in the front seat from gunshot wounds, with Tillie killed in the backseat, both struck multiple times as the vehicle careened off the road following the attack.
Grund had no connection to the gang dispute that got him killed. The station's report notes he was living at an Extended Stay America hotel in Jacksonville for six months prior to his death while caring for his mother and two younger siblings, working late-night rideshare shifts to support his family. He was simply driving his passenger when the ambush began, and per the same account, he was not the intended target.
The $20,000 Bounty and the Gang Feud Behind It
Investigators say the shooting was part of a $20,000 gang-related hit targeting Tillie, and arrest warrants later revealed that Mills confessed to collecting half of that bounty — $10,000 — for carrying out the killing, per the same account. Those same warrants identified Robinson as the lookout and getaway driver who supplied one of the rifles used in the attack, with his arrest coming nine months after the shooting based on statements obtained from co-defendants during interrogations.
Detectives tied the murder-for-hire plot to a violent, retaliatory feud between local rap-affiliated gang factions ATK/NHG, also known as No Hospital Gang, and Bully Gang/6 Block, according to First Coast News. Tillie, who performed as a rapper under the name Tillie, had posted social media videos disparaging a rival Bully Gang member who was killed in Jacksonville in May 2023 — a dispute investigators say ultimately cost him his life and Grund's.
Harris's Escalated Charges and Guilty Plea
Harris was originally charged in October 2023 with accessory after the fact for luring Tillie via Instagram under the pretense of a date. Prosecutors later escalated those charges to two counts of second-degree murder after determining she had discharged a firearm during the attack, according to News4JAX. She pleaded guilty in June 2024, submitting a letter to the presiding judge asking for mercy so she could raise her two-year-old son and alleging that her boyfriend had manipulated her into participating.
Mills was on house arrest at the time of the First Coast News report, and the Jacksonville Sheriff's Office says the investigation remains active. Key questions still linger about Hameen's specific alleged role in the conspiracy and whether any other suspects remain tied to the unpaid half of the gang bounty.
Uber's Response and a City's Shifting Violence Numbers
In the days after the shooting, Uber released a statement confirming it was assisting Jacksonville law enforcement with the investigation and expressing condolences to the families of both Grund and Tillie, First Coast News reported at the time.
The case also sits against a backdrop of dramatic swings in the city's violent crime data. Jacksonville recorded 59 murders in 2024 — its lowest single-year total in more than two decades and less than half its 2023 count — a drop officials credited to targeted Group Violence Intervention strategies, according to the Jacksonville Sheriff's Office. But homicides rebounded to 78 in 2025, even as Sheriff T.K. Waters reported that only one murder that year was officially classified as gang- or group-affiliated, a distinction crime analysts say can understate the problem since uncertified gang associates frequently drive retaliatory violence.
What Hameen and Co-Defendants Could Face
Under Florida Statute § 782.04(2), second-degree murder is a first-degree felony punishable by up to life in prison, with the state's Criminal Punishment Code setting a mandatory minimum of 16.75 years, according to the Brancato Law Firm, PA. Beyond that baseline, Florida's 10-20-Life law under Statute § 775.087 imposes a mandatory minimum of 25 years to life for discharging a firearm during a violent felony that results in death, with no judicial discretion for a lighter sentence, per the Fleming Law Group, PA.
Nearly three years after Grund's family lost him to a gang dispute he had nothing to do with, the case against his and Tillie's killers is still unfolding in Jacksonville courtrooms — with one more defendant now added to the list.
