Three Charged in Jacoi Cosey Reserve Murder

Summary

The St. John the Baptist Parish Sheriff’s Office arrested three people in the shooting death of 18-year-old Jacoi Cosey in Reserve, Louisiana. The defendants are Brandon Blackmore, 20, of LaPlace; Tyshley Marks, 22, of Reserve; and Emanuel Rayfield Jr., 17, of Reserve.

All three were booked with second-degree murder and armed robbery with a firearm. Sheriff’s investigators alleged the group robbed Cosey of his gun before he was killed. Each defendant was reported held on $475,000 bond for the two charges.

The original site headline referred to a single suspect, but the official case record identifies three arrests. this updated article corrects that error and gives the victim, defendants, charges, bond and chronology from the sheriff’s release.

The July 22 shooting

Deputies were called at 9:38 p.m. on Wednesday, July 22, to the intersection of Northwest First Street and Railroad Avenue in Reserve. When they arrived, they found Cosey in the back seat of a vehicle with gunshot wounds.

Cosey was pronounced dead at the scene. The public release does not provide a minute-by-minute account of what led to the shooting, identify every witness or describe exactly where the firearm robbery allegedly occurred relative to the gunfire.

Those omissions matter. The sheriff’s allegation that the suspects robbed Cosey of his gun is a key part of the charging theory, but the detailed evidence supporting that claim belongs in investigative reports and court filings rather than being invented from a short news release.

Investigators identify three suspects

Detectives identified Blackmore, Marks and Rayfield during the investigation. All three were arrested the next day, July 23, according to the sheriff’s office.

The speed of the arrests does not establish guilt. It indicates that investigators believed they had developed probable cause quickly enough to book the three on serious felony counts. The prosecution must still prove its case in court.

Rayfield was 17, but the sheriff publicly identified him in the release. This article follows the official identification because the agency released his name in connection with the adult-level murder and armed-robbery allegations. It does not add private information beyond what is relevant to the public case.

Charges and bond

Second-degree murder is the homicide accusation. Armed robbery with a firearm is a separate felony count tied to the allegation that Cosey’s gun was taken. Charging both offenses allows prosecutors to address the alleged taking of property and the killing as distinct criminal conduct arising from the same episode.

The sheriff’s office reported a $475,000 bond for each defendant on those charges. A bond amount is a pretrial custody decision, not a fine or sentence. It can also be modified by a court later, so the figure should be understood as the amount reported at the arrest stage.

No conviction or sentence was reported in the source set reviewed for this case. The article therefore avoids language that assumes the defendants committed the offenses merely because they were arrested and booked.

Why the correction matters

The prior singular headline materially understated the scope of the case. Readers seeing only “suspect arrested” could reasonably believe police had identified one accused person, when the sheriff’s office in fact announced three arrests and identical major charges.

Correcting the number of defendants also changes how the alleged crime is understood. The prosecution’s theory is not simply a one-on-one shooting; it includes an alleged group robbery and homicide. That has consequences for potential accomplice liability and for how evidence may be attributed among the defendants.

The correction does not go the other direction and label the three as proven killers. It accurately states the charges while retaining allegation language and the presumption of innocence.

Current status

The latest completed substantive event verified here is the July 23 arrest of all three defendants, followed by the sheriff’s public confirmation on July 24. The site date is anchored to the arrest date because that is when the custody and charges became operative.

No reliable later plea, dismissal, indictment, verdict or sentence was located in the reviewed sources through this update. If the district attorney later changes the charges or a court changes bond, that new event should supersede the arrest-stage status.

For now, Blackmore, Marks and Rayfield remain defendants accused of second-degree murder and armed robbery with a firearm in Cosey’s death.

What the sheriff’s release does and does not establish

The sheriff’s office publicly identifies the victim, the three accused people, the two booking charges, the reported bond and the allegation that Cosey’s firearm was taken. It does not say which defendant allegedly fired a weapon, who first possessed the gun, or what statements witnesses gave detectives. Those unanswered questions are important in a three-defendant homicide and should remain unanswered until a reliable court or investigative source supplies them.

Likewise, the identical charges do not necessarily mean prosecutors will present identical evidence against all three. One defendant may be accused as the principal actor while another may face liability for participating in the robbery or aiding the killing. The current record supports the charges and group allegation, but not a detailed division of roles. That boundary is preserved in this updated article.

Sources

1. St. John Parish Sheriff: three arrests in Reserve homicide
2. FOX 8: three arrested after Jacoi Cosey shooting
3. L’Observateur: Reserve homicide arrests
4. WWL: three suspects charged in Reserve homicide

All three named defendants are presumed innocent unless and until proven guilty. The charges and bond figures come from the St. John the Baptist Parish Sheriff’s Office and may change in later court proceedings.