Jones was once the most celebrated female athlete in the world. A runner and long jumper, she won three gold and two bronze medals at the 2000 Olympics in Sydney. Her big smile and charming personality made her a star, and endorsements made her rich.
But in October, Jones told the judge that she'd lied to a federal investigator in November 2003 when she denied using performance-enhancing drugs. She said she took steroids "several times before the Sydney Olympics and continued using them after."
She also admitted lying about her knowledge of the involvement of Tim Montgomery, the father of her son, Monty, in a scheme to cash millions of dollars worth of stolen or forged checks. Montgomery and several others were convicted in that scam. They include former Olympic champion Steve Riddick, who was to be sentenced later on Friday.
Jones returned her Olympic medals even before the International Olympic Committee ordered her to do so and wiped her records from the books.
Jones was among the athletes who testified before a grand jury in 2003 in an investigation into Balco, a lab at the center of the steroids scandal in professional sports. In 2004, she said, "I have never, ever used performance-enhancing drugs." She also sued Balco founder Victor Conte after he repeatedly accused Jones of using performance-enhancing drugs and said he'd watched her inject herself.
But on the day she pleaded guilty, prosecutors said a 2003 search warrant at Balco uncovered ledgers, purchases, doping calendars and various blood-test results connected to Jones and former coach Trevor Graham.
The Associated Press Contributed to this report