Tonya Harding
Harding was America’s golden girl of figure skating before everything went horribly wrong. The ice queen became embroiled in an unpleasant scandal that also involved her husband. He had her rival, Nancy Kerrigan, assaulted, but Harding knew he was planning something. This ended her skating career and she turned to other means to earn money.
She began professional boxing but these were effectively freak shows because of her fame. In the end, she retired with a record of 3-3 and her asthma prevented her from continuing. It was an ignominious end to her sporting life because she offered so much as an athlete (via Radio France).