Further investigation by the Suffolk County Grand Jury resulted in murder charges against a man once charged as an accessory to Cordell McAfee’s murder last year, and both he and another defendant are now held without bail, District Attorney Daniel F. Conley said today.

LAVONRENCE PERKINS (D.O.B. 3/26/90) of Mattapan and ADAM SIMKINS (D.O.B. 10/10/88) of Dorchester were arraigned in Suffolk Superior Court today following their indictments on first-degree murder and related charges for McAfee’s May 7, 2010, shooting death. Both were ordered held without bail.

Perkins has been held without bail since his Jan. 18 arrest on murder charges in Cranston, Rhode Island, where he was found hiding beneath a bed; Simkins was charged in December as an accessory after the fact but was indicted May 6 as a principal in McAfee’s murder. At prosecutors’ request, his prior bail of $350,000 was revoked today.

“Today, a little more than a year after the fact, we have a much clearer view of what transpired that evening,” Conley said. “Thanks to the Suffolk prosecutors and Boston Police detectives who worked this case day and night, Cordell’s family is a little closer to justice.”

Assistant District Attorney Gretchen Lundgren of Conley’s Homicide Unit told Clerk Magistrate Gary D. Wilson that McAfee was doing nothing more than sitting on the porch of a Roseland Street residence with a relative when two gunmen in light-colored hooded sweatshirts strode up and opened fire on them shortly before 6:30 p.m.

McAfee was struck twice and died of his injuries. The second man on the porch fled on foot and was not injured.

Boston Police responded to the scene and, after interviewing witnesses, traveled to a nearby building on St. Mark’s Place. Simkins lived at that building; he and Perkins later exited it separately. A search warrant executed on Simkins’ apartment yielded two light-colored sweatshirts, a pair of revolvers wrapped in tin foil, the cylinder to one of those revolvers wrapped in a separate length of tin foil, and a quantity of crack cocaine.

Specialized testing by the Boston Police Crime Laboratory revealed Simkins’ fingerprints on both pieces of tin foil and his DNA on one of the sweatshirts. Ballistics testing showed that both revolvers had fired rounds that struck McAfee. Witness statements also identified Perkins as one of the shooters.

Katherine Moran is the DA’s assigned victim-witness advocate. Perkins is represented by Peter Krupp and will return to court on June 2; Simkins is represented by attorney Harold Hakala and will return to court on May 24.