If you believe Aaron Hernandez is guilty of murdering Odin Lloyd, you probably also believe this isn’t the first time Hernandez has killed someone.
Hernandez has been charged with a double homicide in Boston and his former friend Alexander Bradley claims that Hernandez shot him in the eye (he was not charged for that shooting). Details of why Hernandez shot him are provided by Big Lead.
During this time Hernandez was a productive and active member of the Patriots. So, if you believe this, Hernandez was able to shoot his friend in the face over a bar tab and then casually play in a playoff game like nothing happened.