The Suffolk County Grand Jury today returned indictments charging two men with the murder of 14-year-old Jaewon Martin earlier this year, setting the stage for their arraignments in Superior Court tomorrow, Suffolk County District Attorney Daniel F. Conley said.

The indictments, which are based upon a four-month investigation by the homicide units of the Suffolk DA’s office and Boston Police Department, charge TIMOTHY “TOOLMAN” HEARNS (D.O.B. 3/13/90) of Dorchester and RAMON “DOUBLE R” SILVELO-MILES (D.O.B. 11/30/89) of Lynn with first-degree murder for Martin’s May 8 shooting death at a basketball court near the intersection of Columbus and Heath streets.

The indictments also charge both men with three counts of armed assault with intent to murder for allegedly attempting to murder another teenage boy and two teenage girls who were also at the scene. They allegedly shot one of those victims, incurring an additional count of assault and battery with a dangerous weapon, and fired at but missed two of those victims, incurring two additional charges of assault with a dangerous weapon.

Hearns is charged with unlawfully possessing a firearm and ammunition; Silvelo-Miles is charged as a joint venturer in the shootings but not with physical possession of the firearm.

Both men are expected to be arraigned tomorrow in the Magistrate’s Session of Suffolk Superior Court tomorrow morning. Hearns is represented by attorney Daniel Beck and Silvelo-Miles by attorney John Galvin.