Sports stars who've fallen from grace

Despite an illustrious college football and NFL career, OJ Simpson is best known for the notorious trial of his ex-wife Nicole Brown's brutal murder. Simpson was found not guilty, but the intense media scrutiny of the trial tarnished his reputation. In 2007, the former American football star served 9 years in prison for armed robbery and kidnapping.

Diego Maradona earned his spot in the pantheon of football greats for his incredible performances in the 1980s, his rag to riches story and the famous "Hand of God" goal in the 1986 World Cup. But his behavior off the field, driven by excessive drug use, caused him numerous suspensions and bans late in his career, and has cast a cloud over his name in the eyes of many.

The American sprinter won five medals in the 2000 Sydney Olympics, catapulting her to stardom. Jones vehemently denied rumors of doping, but a federal investigation into a California lab uncovered evidence of her culpability. In 2007, she publicly admitted to steroid use and lying to authorities. Jones was subsequently stripped of all her Olympic medals and sentenced to 6 months in prison.

Nicknamed the "blade runner," the South African Paralympian made history as the first amputee to compete in Olympic athletics in London 2012, and the first one to earn a medal in the Athletics World Championship of 2011, as part of a relay team. But in 2011 he was found guilty of murder, for fatally shooting his girlfriend Reeva Steenkamp in their home.

The first German to win the Tour de France in 1997, coupled with gold and silver medals at the 2000 Olympic Games in Sydney, Jan Ullrich was among the best cyclists in the world. But in 2013, he admitted publicly to blood doping. After retirement, his life has been marred by scandal, from drunk driving to recently breaking into his neighbor's house in the Spanish island of Mallorca.

Harding (left) overcame a troubled upbringing to become a figure skating star, and her fierce rivalry with Nancy Kerrigan captured global attention. But then Kerrigan was injured in an attack that kept her from the 1994 World Championships, where Harding won gold. When Harding and her ex-husband were linked to the attack, she was banned from competition for life and stripped of her medal.