The four include Jai Dillard, Claude Pagou, Kentrell Spight, all 18, and Juanyai Walls, 19.
They were indicted on two counts each of premeditated first-degree murder, first-degree murder in the perpetration of an aggravated robbery, and especially aggravated robbery.
Investigators said they killed Jereme Jones and Devonte Taylor, both 19, who had posted guns for sale on social media. The defendants knew the victims and arranged to meet with them in the park.
The two victims were found shot to death in the front seat of their car, which was idling when passersby by noticed them and called police.
The case is being handled by Chief Prosecutor Paul Hagerman of the DA’s the Crime Strategies Prosecution Unit which incorporates and expands the work of the Multi-Agency Gang Unit, the Organized Crime Unit, Project Safe Neighborhood/Gundone, GunStat, the Safe Streets Task Force and the Violent Crime Unit.