Before Aaron Hernandez was charged with Murder One - the Patriots cut ties with him. Before Aaron Hernandez was arrested at his home - the Patriots cut ties with him. Even before officially releasing him - the Patriots cut ties with him.
Many times the cops know who committed a crime but they just can't prove it. Shortly after the body of Odin Lloyd was found and Hernandez was connected to the murder - the Patriots told Aaron Hernandez that he was no longer welcome at the team facilities in Foxboro. My guess is some police that the Patriots brass know and trust told them that Hernandez was in their opinion guilty as a murderer. So when Hernandez showed up at team facilities a few days ago they said, "No - you are no longer part of this team. You are not welcome here."
They couldn't say it fast enough.