FILE - In this June 13, 2008 file photo, R&B singer R. Kelly leaves the Cook County Criminal Court Building in Chicago after a jury found him not guilty on all counts in his child pornography trial. In 2002, Kelly was indicted on 21 counts of child pornography, based on a videotape allegedly showing him having sex with an underage girl. (AP Photo/Nam Y. Huh, File)
FILE - In this June 13, 2008 file photo, R&B singer R. Kelly leaves the Cook County Criminal Court Building in Chicago after a jury found him not guilty on all counts in his child pornography trial. In 2002, Kelly was indicted on 21 counts of child pornography, based on a videotape allegedly showing him having sex with an underage girl. (AP Photo/Nam Y. Huh, File) Credit: Nam Y. Huh

CHICAGO — R. Kelly, the R&B star who has been trailed for decades by allegations that he sexually abused underage girls and women and held some as virtual slaves, was charged on Friday with aggravated sexual abuse involving four victims, including at least three between the ages of 13 and 17.

In a brief appearance before reporters, Cook County State’s Attorney Kim Foxx announced the 10 counts against the 52-year-old Grammy winner and said the abuse dated back as far as 1998. She did not comment on the charges or take questions.

The singer, who has consistently denied any sexual misconduct, was to appear in court on Saturday. A message seeking comment from Kelly’s attorney, Steve Greenberg, was not immediately returned.

His arrest sets the stage for another #MeToo-era celebrity trial. Bill Cosby went to prison last year, and former Hollywood studio boss Harvey Weinstein is awaiting trial.

Kelly, best known for hits such as I Believe I Can Fly, was charged a week after Michael Avenatti, the attorney whose clients have included porn star Stormy Daniels, said he recently gave Chicago prosecutors new video evidence of the singer having sex with an underage girl. It was not immediately clear if the charges were connected to that video.

In 2008, a jury acquitted Kelly of child pornography charges over a graphic video that prosecutors said showed him having sex with a girl as young as 13. He and the young woman allegedly depicted with him denied they were in the 27-minute video, even though the picture quality was good and witnesses testified it was them, and she did not take the stand.

Charging Kelly now with sexual assault for actions that occurred within the same time frame as the allegations from the 2008 trial suggests the accusers are cooperating and willing to testify.

Because the alleged victim 10 years ago denied that she was on the video and did not testify, the state’s attorney office had little recourse except to charge the less offense under Illinois law, child pornography, which requires a lower standard of evidence. Each count carries up to seven years in prison.

Legally and professionally, the walls began closing in on Kelly after the release of a BBC documentary about him last year and the multipart Lifetime documentary Surviving R. Kelly, which aired last month. Together they detailed allegations he was holding women against their will and running a “sex cult.”

After the latest documentary, Foxx, said she was “sickened” by the allegations and asked potential victims to come forward.

#MeToo activists and a social media movement using the hashtag #MuteRKelly called on streaming services to drop Kelly’s music and promoters not to book any more concerts. And protesters demonstrated outside Kelly’s Chicago studio.