Kenneth Berris was a veteran Chicago Police Department detective who testified about his investigation of O.J. Simpson's room at the O'Hare Plaza Hotel on June 13, 1994 — the morning after the murders. Called by the defense and examined by Johnnie Cochran, Berris described blood evidence found in the hotel room, though under Christopher Darden's cross-examination he acknowledged missing laundry bags and a lack of blood drops elsewhere, suggesting minimal forensic rigor in the investigation. His testimony touched a critical link in the evidence chain: what physical traces Simpson left behind in Chicago during the narrow window after the killings.