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(CNN) -- Aaron Hernandez, the former NFL tight end charged with murder in the death last week of an acquaintance, is now being investigated in connection with a double slaying 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, that's 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.
Hernandez, who was released by the New England Patriots on Wednesday after his arrest, will be back in a courtroom Thursday for a bail hearing.
Hernandez is scheduled to appear at Fall River, Massachusetts, Superior Court at 2 p.m. to appeal a judge's decision to hold him without bail, the court magistrate 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.
Hernandez is accused in last week's shooting death of Lloyd, whose body was found in an industrial park area less than a mile from Hernandez's home.
He has pleaded not guilty.