King County prosecutors say they cannot proceed with rape charges against rapper Nelly because the accuser is not cooperating.

The alleged incident happened in Auburn in October while Nelly was on tour.

According to the jail's inmate database, Nelly, whose real name is Cornell Iral Haynes Jr., was arrested on suspicion of second-degree rape, indicating force was used, or the victim was incapable of consent due to being physically helpless, mentally incapacitated or developmentally disabled.

A few days later, the accuser's attorney said his client wanted Auburn police to end the criminal investigation and that she would not testify against him.

"While we have reviewed the existing investigative material, without the assistance of the complainant, this office is unable to proceed or fully assess the merits of the case," the prosecutor's office said in a statement Thursday.