Tonya Harding
Harding broke through social barriers as she became the face of American figure skating. She was the first American woman to pull off a triple axel in a competition. This outstanding achievement transformed her into America’s sweetheart. But it was too good to be true as her rivalry with Nancy Kerrigan became toxic.

In the end, her ex-husband Joe Gilooly hired a bruiser to attack Kerrigan before the Lillehammer Olympics. Harding denied any knowledge of the assault but an investigation decided against her. It damaged her image irrevocably and ended her time in the sport. Her fall from grace was as quick as her rise to fame (via Olympic.com).