Investigators' quieries come as the Lifetime series adds a new dimension to the sexual abuse allegations Kelly has faced for the better part of his almost 30-year career.
The state's attorney's call to action followed reports that Kelly is under criminal investigation in Georgia.
The series "Surviving R. Kelly" began airing last week on the Lifetime TV channel, bringing decades of abuse allegations against the "Pied Piper of R&B" to nearly 20 million viewers. Kelly and the alleged victim, in her 20s at the time of the trial, denied it was them in the video. She tells WGN wanted to tell her story for a long time.
"As I grew older, he lost interest in me", she said. Trust, I have been deeply affected by all of this Anyone that knows me personally or has been following me throughout the years knows that I do not have a relationship with my father. "She just would leave it at, 'That dude was a bad man, '" the 47-year-old said.
Savage and his wife Jonelyn have been trying for years to get back their daughter Jocelyn, who ran off to be with Kelly shortly after meeting him backstage at a concert when she was only 17.
Cook County State's Attorney Kim Foxx addressed reporters on Tuesday afternoon after her office had been inundated with calls about the allegations in the documentary, some tied to his Chicago-area home.
"He just told me to take off my clothes and we would proceed from there", she said.More news: Padraig Harrington named as Europe's 2020 Ryder Cup Captain
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Foxx said her office has been in contact with two families who say they were victims.
Steve Greenberg, Kelly's attorney, said in an emailed statement: "Mr. Kelly did not sexually abuse anybody, at anytime, not when he was in high school and not after".
Lady Gaga is pulling her 2013 song with R. Kelly, "Do What U Want (With My Body)" from streaming services.
"No one has ever seen any evidence of it", he said.
The series follows the BBC's "R Kelly: Sex, Girls & Videotapes", which was released previous year.
TMZ reported that police received a call informing them that Kelly was at the club and there was a warrant for his arrest, but after officers arrived at the venue and made contact with the singer, they were informed there actually was no warrant. Russell accused Savage of lying to Lifetime and that if he continued to support the series, Russell and Kelly would be forced to release information that would show Savage was a liar.
"I believe the documentary has opened up a new era".