(CNN) -- Aaron Hernandez, the former NFL tight end <No mention of Patriots*
> charged with murder in the death last week of an acquaintance, is now being investigated in connection with a double homicide in Boston's South End in July 2012, a law enforcement source close to the investigation told CNN.
The source gave no indication whether there was any connection between that investigation and Hernandez's current murder charge.
What is known is that the Boston Police Department has located and impounded a silver SUV with Rhode Island registration that police have been trying to find for almost a year, which is linked to the scene of a double homicide in 2012, the source said. Investigators believe that Hernandez was renting the SUV at the time of those killings, the source said.
A second man arrested in connection with the killing of Odin Lloyd is also expected to appear before a judge. Carlos Ortiz was arrested in Bristol, Connecticut, on Wednesday and will have an initial hearing in Attleboro, Massachusetts, District Court as early as Thursday, a source with knowledge of the investigation told CNN.