Jacoi Cosey, 18, Killed in Reserve Shooting as Three Suspects Face Murder Charges

 A quiet night in Reserve was shattered by a deadly act of violence that claimed the life of an 18-year-old young man and left a community searching for answers. Jacoi Cosey’s death has now led to multiple arrests as authorities continue working to uncover the full circumstances surrounding the fatal shooting.

According to the St. John the Baptist Parish Sheriff’s Office, deputies responded at approximately 9:38 p.m. on July 22, 2026, after receiving reports of gunfire near the intersection of Northwest First Street and Railroad Avenue in Reserve, Louisiana. When officers arrived, they found Cosey suffering from gunshot wounds while seated in the back seat of a vehicle. Emergency responders attempted to provide assistance, but Cosey was pronounced dead at the scene.

The investigation quickly became a homicide case as detectives began gathering evidence and working to identify those responsible. Authorities said investigators later determined that three individuals were allegedly connected to the deadly incident. Officials reported that the suspects were taken into custody on July 23 following an extensive investigation by detectives with the St. John the Baptist Parish Sheriff’s Office.

Authorities identified the arrested individuals as Brandon Blackmore, 20, of LaPlace; Tyshley Marks, 22, of Reserve; and Emanuel Rayfield Jr., 17, of Reserve. According to investigators, the suspects allegedly robbed Cosey of his firearm before the shooting occurred. Each person has been charged with second-degree murder and armed robbery with a firearm, both felony offenses.

The sheriff’s office said all three suspects are being held on $475,000 bond as the criminal case moves forward. While arrests have been made, investigators continue reviewing evidence and examining the events that led to Cosey’s death. Officials have not announced whether additional suspects may be identified or whether more charges could be filed as the investigation continues.

For the Reserve community, the loss of an 18-year-old resident has brought grief and concern as residents reflect on the impact of violent crime. Family members, friends, and those who knew Cosey are left mourning a life that ended far too soon. In the aftermath of a tragedy like this, communities often come together to support those affected while seeking accountability and answers.

Authorities have not released further details about what led to the confrontation or the moments immediately before the shooting. Investigators continue working to establish a complete timeline and understand every factor involved in the case. The ongoing investigation will rely on evidence, witness information, and additional findings gathered by detectives.

The charges against the three suspects represent the current stage of the investigation, and all individuals involved will have their cases handled through the legal process. Officials continue encouraging anyone with information about the homicide to come forward and assist investigators as they work to fully understand what happened that night in Reserve.

As the investigation remains active, thoughts and condolences remain with Jacoi Cosey’s family, friends, and everyone affected by his death. His passing has left a lasting impact on the community, while authorities continue pursuing answers in a case that has brought heartbreak and a demand for justice.