They face charges of murder, robbery with a dangerous weapon, and conspiracy to commit robbery, according to arrest warrants.
The warrants accuse them of conspiring with two other people. Police say the investigation is ongoing.
Police responded to the scene of a shooting at that location near the U.S. Highway 1/401 split around 8:30 p.m. on December 2, 2011.
EMS personnel determined Mohram had sustained a gunshot wound and transported him to WakeMed, where he later died.