A former Olympic sprinter has been sentenced to 21 years in prison after pleading guilty to raping a woman in a New York park.

Prosecutors say 31-year-old Alvin Henry was dubbed the Lover's Lane Rapist for secretly recording a woman having sex in the park with her boyfriend. They say he followed the woman and threatened to show the video unless she had sex with him.

Henry was charged with attacking women in parks in Brooklyn and Queens. He pleaded guilty to a June 2007 attack on Wednesday.

Henry was a member of Trinidad and Tobago's 400-meter relay team in the 2000 Olympics.

A defense lawyer says Henry got caught up in a lot of things after someone introduced him to cocaine to give him an edge while training.