A former friend of Aaron Hernandez has testified before a grand jury about a 2012 South End double homicide where Hernandez is a suspect. Bradley Alexander was reportedly with the former Patriots player the July night two men in a BMW were gunned down by someone in a silver SUV. Police believe Hernandez may have been the triggerman. Hernandez is already charged with the June 26th execution of his one-time pal Odin Lloyd.

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