Late on the night of August 4, 2010, a badly beaten young man arrived at the trauma ward of Jackson Hospital here. Although the patient was hardly a flight risk, security was tight and prison guards crowded into the emergency room as doctors began treatment.

The patient's limp body spoke to the savagery of an assault that had left deep contusions on his legs and torso, and inflamed knots bulging from his head and face. He was unresponsive, with fixed and dilated pupils, and doctors quickly diagnosed a traumatic brain injury. Only a ventilator kept him alive. He never regained consciousness and died the next day.

His name was Rocrast Mack. Mack, who was sentenced to 20 years behind bars after pleading guilty to selling $10 worth of crack cocaine to an undercover cop in 2009. An Alabama prison inmate, his death at age 24 came at the hands of six corrections officers, who took turns battering him with their fists, feet and batons in retribution for a minor altercation with a female guard earlier that night, according to witness accounts and prison records.