(CNN) -- Ex-New England Patriots tight end Aaron Hernandez has been charged with two counts of first-degree murder in the July 2012 killings of two men in Boston, authorities said Thursday.
Hernandez, 24, could be arraigned as early as next week. He is currently in jail awaiting trial in a separate case: the 2013 slaying of Odin Lloyd, who was dating a sister of Hernandez's fiancee.
Suffolk County District Attorney Daniel Conley said at a news conference Thursday that a grand jury returned the indictments in the shooting deaths of Daniel de Abreu and Safiro Furtado.
"Mr. de Abreu and Mr. Furtado were ambushed and executed as they drove home along Shawmut Avenue in Boston's South End in the early morning hours of July 16, 2012," Conley said.
Hernandez charged in 2012 double murder
In addition to the two counts of first-degree murder, Hernandez also has been charged with three counts of armed assault with intent to murder and one count of assault and battery by means of a dangerous weapon, the district attorney added.
The latter four counts reflect shots fired at three people, one of whom was wounded, inside the car that de Abreu and Furtado were in, Conley said.
Conley said that Hernandez was driving an SUV that pulled up alongside de Abreu and Furtado's car near the nightclub and that the former football star fired a .38-caliber revolver at them.
Hernandez has also been charged with unlawfully carrying the gun he allegedly used in the attack, Conley said. The gun has been recovered by authorities.
CNN's calls to Hernandez's attorney were not immediately returned.