Attorney Alan Jackson said in a statement Thursday night that the allegations are false and the work of an angry ex-girlfriend.
Manhattan Beach police spokesman Sgt. Tim Zins said earlier in the day that a police report had been filed accusing Withey of domestic violence. He said detectives are investigating.
The Jazz said in a statement that the team is aware of the allegations but would not comment until they had a better understanding of the situation.
Police say the Los Angeles County district attorney's office will have to determine whether Withey will be charged with a crime.