Last summer, two men were shot to death in the South End.
An SUV matching the description of a vehicle involved in the shooting was found in Hernandez’s uncle’s garage in Bristol, Connecticut.
Hernandez is already facing murder charges in the killing of 27-year-old Odin Lloyd of Dorchester.
One of the officials with knowledge of the Suffolk grand jury told the Globe that investigators are not in a hurry to charge Hernandez in the 2012 murders because he is being held without bail.
Sources tell WBZ-TV that Hernandez was angry with Lloyd for talking to someone about the South End attack.