Four teenagers, including two from Forsyth County, have been indicted in connection with an armed robbery and fatal shooting last summer at a local grocery store.A Forsyth County Grand Jury last week indicted both Sharod Johnson, 18, of 3555 Balli Bandon Court, and Tyrice Kendall Adside, 19, of 3320 Spencer St., on two counts of armed robbery, one count of aggravated assault, one count of murder and two counts of felony murder.Nakitta Holmes, 19, and a 16-year-old juvenile, both of whom are from Buford, were also indicted on the same charges. In addition, Holmes was indicted on one count of possession of a firearm by a convicted felon.Court documents show he had been convicted of burglary in Gwinnett County on March 12, 2010.The suspects were arrested within days of the late-night Sept. 5 slaying of 37-year-old David Casto of Winder, who was killed while working security at Ingles on Canton Road.Casto reportedly was shot execution style with his own 9 mm weapon while bound with duct tape in the store.The suspects also have been accused of taking his bulletproof vest. Authorities have maintained that Holmes was the gunman.An attachment to the indictment shows that the Grand Jury found three "statutory aggravating circumstances" against the suspect.