The entertainment news Web site said Knight got into an argument with another man, and then he and his companions allegedly knocked the other man to the ground. The man allegedly landed a blow on Knight's face that made him unconscious for about three minutes.
"I want my money," Knight was overheard saying to the man.
The altercation took place Saturday night outside Shag nightclub.
His companions put Knight into an sports utility vehicle. A woman at the wheel tried to drive away but was removed from the vehicle after she hit a parked car and then reversed into another one. Another driver then took over.
Police attempted to interview Knight at the hospital.
Knight, one of the co-founders of Death Row Records, was one of the most influential promoters in rap in the mid-1990s. In 1997, he was jailed on a parole violation.