Prosecutors at the R Kelly child pornography trial are trying to link the R&B star to the videotape at the centre of the case.
A retired investigator with the Cook County state attorney's office testified today that he went to a home on Chicago's North Side in 2002 that had been owned by the singer.
Former investigator John Kelly says he saw a "hot tub room" in the home that appeared to be the same room in the sexually explicit video.
Prosecutors played the sex tape in court today. Authorities contend it shows Kelly engaging in sex with an underage girl and takes place in a distinctive room with a log cabin theme.
A defence lawyer countered that Kelly moved out of the home at least several weeks before the investigator arrived.
Kelly has pleaded not guilty to charges that accuse him of videotaping himself having sex with an underaged girl.
Separately, a childhood friend of the alleged victim said she recognised her longtime friend in the video.
Twenty-four-year-old Simha Jamison testified today that she and the alleged victim were best friends for about ten years.
Jamison says she and her friend visited the R&B star at his recording studio and at a Chicago basketball court dozens of times starting when they were around 12. And she says they visited the home where authorities say the sex tape was filmed.
Defence lawyers plan to cross-examine Jamison.
