A woman who accused the multiplatinum rapper Nelly of raping her on his tour bus after a concert last weekend in Auburn, Wash., has told the local police that she will not testify against him and wishes to end the investigation, her lawyer said Friday.

“We do not live in a society where a 21 year old college student can feel safe enough to pursue criminal charges against a celebrity for an alleged rape,” Karen Koehler, the lawyer for the accuser, wrote in an open letter that she posted on Twitter. She said the woman had made her desire to “put a halt to the criminal investigation” known to the Auburn Police Department and the King County Prosecutor’s Office on Friday afternoon.

“She will not testify further in a criminal proceeding against him,” Ms. Koehler wrote.

Cmdr. Steve Stocker of the Auburn Police Department said that the investigation was proceeding as of Friday afternoon. “We’re not going to just halt the investigation,” he said. “We’re still investigating the case, and it’s probably going to be referred to the prosecutor’s office sometime next week.”

Scott Rosenblum, a lawyer for Nelly, said in a statement that the accuser’s desire to end the investigation was “welcome news.”