An Illinois prosecutor dropped 10 charges of sex abuse against the singer R. Kelly on Monday, saying the cost was one of the factors she weighed in her decision.

Kelly, whose real name is Robert Sylvester Kelly, is already serving a 30-year prison sentence on charges of federal racketeering and sex trafficking after he was convicted in New York last year.

Cook County State’s Attorney Kim Foxx told reporters that her office believes “justice has been served” with the two convictions. She said her office’s “limited resources and court time” were the ultimate factors, noting that it found the accusations to be credible.

“Mr. Kelly is looking at the possibility of never walking out of prison again,” Foxx said.