Michael Vick
The American football quarterback spent 21 months in prison for being involved in an illegal interstate dog fighting ring. On his release in 2009, he joined the Philadelphia Eagles and this year transferred to the New York Jets.
Suaia Matagi
At 19, Matagi was serving a three-year jail term for serious assault. He vowed to turn his life around - he found God, then a job and started making a name for himself in Auckland league circles. Last year, the 26-year-old made his NRL debut with the Warriors and played for Samoa at the World Cup.
Joey Barton
The English footballer was sentenced in 2008 to six months in prison for assault as well as a four-month suspended sentence after an assault on a team-mate during a training ground dispute. Barton has three times been charged with violent conduct by the England FA but still forged a long career with Manchester City, Newcastle and Queens Park Rangers.