Two young men were engaged in an argument on social media and decided to meet at the park to fight, Jones said.
When a 21-year-old showed up, police said a 17-year-old suspect opened fire and killed him.
“The suspect was 17 and the victim was 21,” Jones said. “So again, we have somebody who is a juvenile who is committing violent offenses here.”
Two teen brothers, 17-year-old Kaleb Williams and 13-year-old Joshua Williams, were gunned down during a fight near a Southeast Arlington apartment complex.
Police said the argument began at a nearby barbershop and spilled over into the apartments.
A third juvenile who was shot and injured is facing two counts of capital murder.