authorities identify the friend with hernandez that night as alexander bradley, the man who says hernandezright eye seven months later. the motive for the bradley shooting now appears clear. prosecutors say hernandez was trying to shut him up about the boston double murder. all leading to a key question. does the boston case, along with the odin lloyd murder, suggest a dangerous pattern of behavior, driven by paranoia. being able to explain hernandez's behavior that night could help prosecutors at trial. eight months into the case, prosecutors bolster it by upgrading charges against the two men with hernandez, the night odin lloyd is killed. ernest wallace, and another man, carlos ortiz. >> how do you plead? >> not guilty. >> not guilty. >> this will be what's called a joint venture murder prosecution, where anyone who actively participates in the murder can be held guilty for the murder. >> that would mean hernandez could be convicted of murder even if prosecutors can't prove he fired the gun. ahead, videotape, tire tracks, gun shells, but no gun. aaron hernandez's first murder trial begi