It wouldn't surprise me if he has a lot of personal demons. He never knew his father. His mom was in and out of prison. She was found in an abandoned building beaten to death when he was 13 (that tattoo on his neck is his mother's name). He had been living with his grandmother, and then his grandmother died. He bounced around living with aunts and getting into trouble until a friend's family adopted him (and probably saved his life). His cousin and best friend was shot down a year later. Another close friend was shot and killed right after that. He went off to Ohio State and his best friend on the team, Jayson Gwinn, died in a car accident.
Here's a long article about his childhood The Sporting News wrote his senior year at Ohio State.
http://findarticles.com/p/articles/mi_m1208/is_n51_v219/ai_17909428
Playing football probably gave him enough structure to keep him focused. Now he's left to his own devices with a lot of free time and money on his hands. He was a good teammate and a good professional for the Cowboys. I hope he rises above his demons.