A pivotal day combining expert testimony on evidence integrity with O.J. Simpson's direct account of his relationship with Nicole Brown Simpson. Henry Lee's cross and redirect examination probed blood evidence and sock transfer patterns, while coroner criminalist Gary Siglar's deposition revealed significant chain-of-custody irregularities in how blood samples were released to police. Simpson testified extensively about his life, the 1989 domestic violence incident (admitting he was 'very physical' with Nicole but denying intentional strikes), and his relationship trajectory with her through 1994, attempting to rehabilitate his credibility on the central domestic violence issue.

• Henry Lee concedes he has no scientific evidence that law enforcement planted evidence, significantly undermining a cornerstone of the defense strategy.
• Gary Siglar reveals he personally released blood samples to Detective Vannatter—an acknowledged uncommon and irregular procedure.
• O.J. Simpson admits being 'very physical' with Nicole in 1989 but explicitly denies intentionally hitting or slapping her.
• Defense systematically links crime scene physical evidence positions to establish a prolonged struggle narrative at Bundy Drive.
• Plaintiff's counsel successfully moves to bar introduction of Nicole's alleged drug use, drinking, and romantic history.