Aaron Hernandez in Jailhouse Brawl

Apparently "behind bars" does not translate to "staying out of trouble" when one is Aaron Hernandez: Sources tell TMZ the former New England Patriot beat up a fellow inmate at Bristol County Jail yesterday. The sources say the two had been at odds all day (according to Radar, the other man had been "bullying" Hernandez since he was imprisoned on murder charges in June) and that Hernandez—who is typically kept separated out of concern that other inmates might target him—was for some reason allowed to walk down a hallway, where he caught sight of the other inmate and allegedly attacked him. The sheriff confirms there was a fight, but says neither inmate was seriously injured. The incident is under investigation. (More Aaron Hernandez stories.)