A law enforcement source told 'CBS News' prosecutors in Chicago have obtained a nearly 45-minute VHS tape recording.
Lawyer Michael Avenatti turned the video over to the Cook County state's attorney and told CBS News he got the tape from someone who knows both R. Kelly and the alleged victim "extremely well." CBS News has not viewed any of the footage, but Avenatti said he and Illinois prosecutors are certain Kelly is the man on the tape, reports CBS News correspondent Jericka Duncan.
Avenatti said someone came to him last April with the tape, believed to be from the late 1990s. He claims R. Kelly's voice can be heard on the recording and that a telltale mole on his back is clearly visible.
"This is deviant conduct … R. Kelly deserves to spend the rest of his life in a penitentiary," Avenatti said. "There's 2 different scenes shot on two separate days on this tape … I was disgusted by what I viewed …This is a disgusting video."
CBS News has confirmed the video was recently turned over to the Cook County state's attorney in Chicago, where Kelly lives and has a music studio.
Asked if he believes Kelly might be arrested in the next few days, Avenatti said, "I want to be very careful on how I answer this question. I don't think it's going to take a significant amount of time for R. Kelly to be indicted and arrested in Chicago."
Avenatti said he could not comment on whether or not the person in the tape is cooperating with law enforcement.
On Thursday, Kelly's attorney, Steve Greenberg, said Avenatti may have committed a felony by showing the video to reporters. Greenberg again denied Kelly did anything illegal.
"I have a client who hasn't committed any crime, so I don't have a lot of work to do as a criminal defense lawyer," Greenberg said.
Kelly was acquitted on child pornography charges in 2008 after disputing he was the man seen in a grainy video having sex with an underage girl. Avenatti said the tape in that case is different from the one he provided. He did not say whether the new tape showed a different alleged victim.
"This is a bombshell of epic proportions … this is the piece of evidence that I think prosecutors have needed for the better part of two decades. In my opinion, it's over for R. Kelly," Avenatti said.
Kelly's attorney said his client has been "adjudged guilty in the public eye," and blamed the recent airing of the lifetime docu-series Surviving R. Kelly. The Cook County state attorney's office says it will not confirm or deny any ongoing investigations.
This story was originally published by CBS News on Feb. 15, 2018 at 7:34 a.m. ET.