LAS VEGAS -- Former rap impresario Marion "Suge" Knight has been arrested on suspicion of beating a woman while holding a knife, Metro police said.

The assault happened early Wednesday morning. According to reports, Knight and his girlfriend of three years got into an argument while driving. She said he punched her in the back of her head while they were driving, police said. She attempted to grab the wheel and cause a wreck, police said, causing the car to stop on the curb.

The woman ran from the car. As Knight caught up with her, police arrived at the scene.

Knight has been booked into Clark County Detention Center on charges of assault with a deadly weapon, possession of a controlled substance, possession of a dangerous drug without prescription and battery domestic violence.