He was indicted earlier this month in connection with the July 2012 shooting deaths of Daniel de Abreu and Safiro Furtado. A third man was wounded.
Prosecutors said Hernandez ambushed and gunned down the men after a chance encounter inside a Boston nightclub. He is scheduled to be arraigned Wednesday in Suffolk Superior Court.
He has already been charged in a 2013 murder. He pleaded not guilty in the killing of semi-pro football player Odin Lloyd.
Hernandez was released by the Patriots last summer after his arrest in Lloyd's death.
His lawyers have said he looks forward to proving his innocence.