Authorities believe they know who fired the shot that left an 18-year-old dead after a chaotic altercation between rival gangs broke out at Indian Mounds Regional Park earlier this spring.

Rayvion Trebor Brooks, 18, of St. Paul now faces second-degree murder charges in the April 17 incident that killed Bobby Davion Collins, according to an amended complaint filed against him late last week in Ramsey County District Court.

Brooks, a suspected member of the gang Forever After Money, previously had been charged with one count of committing a crime for benefit of a gang and one count of first-degree riot for his role in the shooting. Related Articles Mounds Park peace rally: ‘Violence is not welcome here’

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The six charges filed against him now include murder in the second degree and committing murder in the second degree for the benefit of a gang.

Brooks pleaded not guilty to the charges Wednesday. His bail was increased to $500,000.

His attorney could not be immediately reached for comment.

MELEE TURNS FATAL

According to witness testimony collected by police, the shooting took place around 7 p.m. after Brooks was approached by a group of men from a rival gang.

The teen and his girlfriend, who had been at the park, were walking back to their car. That’s when a black SUV drove by and occupants inside flashed gang signs at Brooks, according to statements both Brooks and his girlfriend later made to police that were included in the criminal complaint.

Shortly afterward, the girlfriend told officers that a group of four men approached Brooks and that one of them, 18-year-old Rashawn Porter, started egging Brooks on to fight.

Nervous that her boyfriend would be jumped instead of allowed a fair one-on-one fight with Porter, the girlfriend told officers she took out pepper spray and began screaming. She said the commotion led several other people in the park to come over to see what was happening.

Sometime later, “all hell broke lose,” as Porter allegedly threw a stick at Brooks, shots were fired and people took off running, the complaint said.

Police arrived to find Collins unresponsive and bleeding. He died of a gunshot wound to the head.

EVIDENCE POINTS TO BROOKS, COMPLAINT SAYS

Through witness testimony and forensic evidence collected from bullet fragments found in Collins’ head, police eventually focused on Brooks as the shooter.

The bullet fragments reportedly matched the gun that a witness at the scene, 32-year-old Glen Dale Acon Jr., told police Brooks grabbed from him during the commotion. The firearm was a .357-caliber SIG Sauer semiautomatic handgun, the complaint said.

Acon said Brooks grabbed it after another man, 24-year-old Samuel Andrew McCormick, continued to flash a gun he had tucked in his waistband.

While Acon said he never actually saw Brooks fire his weapon, he said the gun didn’t have any bullets in it when Brooks returned it to him. Acon said about seven or eight had been loaded in it when Brooks initially took it.

Another person interviewed by police reportedly told officers that Brooks arrived at his house about 8 p.m. that night sweaty and confessional. He reportedly said he’d just shot someone in a “crowd … 50 people deep” after the group had tried to jump him, the complaint said.

Brooks also reportedly admitted that the group had started to disperse once he raised the gun, but that he shot anyway. He said other people fired back.

Police uncovered shell casings from at least four different guns at the park, the complaint said.

Later that day, McCormick reportedly showed up at an area hospital with a gunshot wound to his leg. The person who drove him to the hospital told police they had been at the dispute at the park and that they had a gun in their car. Officers later recovered it.

BROOKS DENIES SHOOTING

When he was arrested by police on April 18, Brooks said he and his girlfriend had been at the park with her family the previous evening when four males approached him and asked him to fight. He said the group eventually swelled to 30. At some point, he said, Porter threw a stick at him and then gunshots started sounding, prompting him and others to run.

He denied being in possession of a gun at the scene or firing any shots.

In addition to Brooks, Porter, Acon and McCormick were also all charged for their roles in the melee.

McCormick, of St. Paul, and Acon, of Coon Rapids, both face charges of first-degree riot. Porter is charged with third-degree riot.

While Prince Williams, 24, had also faced a charge in the incident, the case was dismissed, according to Dennis Gerhardstein, a spokesman for the Ramsey County attorney’s office.

Porter has suspected ties to the Everybody Killer gang, considered a younger version of the Eastside Boys.

McCormick is allegedly affiliated with the Eastside Boys.

In a four-day span — including the April 17 shooting — a total of nine people were shot in St. Paul, two fatally. The two fatalities were Collins and 31-year-old Charles Anthony Hudson of South St. Paul.

The shootings prompted community leaders to call for action to tamp down violence.