A US man has claimed to have found a video tape allegedly showing R. Kelly "sexually abusing underage African-American girls."
Gary Dennis told reporters that he handed the tape to authorities after discovering it at his house.
R. Kelly was charged last month with 10 counts of aggravated criminal sexual abuse involving four alleged victims, three of whom were minors.
The R&B artist has denied appearing in the video, and all other charges.
If convicted, he faces three to seven years in prison on each count.
Mr. Dennis, a nursing home worker, said he came across the footage whilst sorting through a box of old video tapes.
After the discovery he said he had a "moral duty" to notify law enforcement and contacted Gloria Allred, a lawyer representing women who claim to have been sexually abused by R. Kelly.
The tape was then turned over to the US Attorney for the Eastern District of New York.