Fairfax Police say 34-year-old Delante T. Cook of Prince George's County took part in a meticulously planned robbery in the residential neighborhood of Ravensworth Farm in Springfield on Nov. 19, of 2008.
Neil MacBride is the U.S. attorney for the Eastern District of Virginia, where Cook faces charges.
He says Cook, along with a man named Jelani Slay and at least one other person worked together in the robbery that led to the stabbing deaths of brothers Ryan and Terence Strope, and their friend Andres Yelicie.
Police say the Stropes may have been involved in dealing marijuana.
"Mr. Cook and his co-conspirators adopted the appearance of police officers to gain entry into the homes they were targeting to rob for drugs and money," MacBride says.
For now Cook has not been charged in connection with the murders, but police say the investigation is ongoing.
Fairfax Police Chief David Rohrer says Slay, the other man named in the indictment, died in 2009 after alleged trying to rob an off-duty D.C. police officer and exchanging gunfire with the officer.