Former welterweight champion Victor Ortiz surrendered to police in Oxnard, California, on Tuesday after he was charged with three counts of felony sexual assault.
According to TMZ Sports, a woman said Ortiz sexually assaulted her at a home March 19.
He has been charged with forcible rape, forcible oral copulation and forcible digital penetration.
The Associated Press reported Ortiz was released on $100,000 bail.
Ortiz has a history of legal trouble.
In 2015, he was arrested on suspicion of assault with a deadly weapon during a Kenny Chesney concert at the Rose Bowl in Pasadena, California. Ortiz later pleaded guilty to misdemeanor battery and received three years' probation.
He also pleaded guilty to misdemeanor DUI in October 2017 after he was arrested Sept. 24, 2016, with a reported blood alcohol content in excess of 0.15.
Ortiz (32-6-3, 25 KOs) has lost four of his last eight fights since September 2011. His last appearance came in February when he fought Devon Alexander to a draw.
The 31-year-old is scheduled to fight John Molina Jr. on Sunday in Ontario, California. It's unclear if the bout will proceed as planned.