Source: Grand jury hears evidence against Patriots' Hernandez

(CNN) -- A Suffolk County grand jury looking into the double homicide of two men in Boston's South End last July has been meeting for at least two weeks, a law enforcement source close to the investigation told CNN on Wednesday.

Prosecutors are presenting evidence to try to connect former New England Patriots tight end Aaron Hernandez to those shootings, according to the source,

Hernandez is currently charged with premeditated murder stemming from the death of a man in June.