The prosecution spent Day 9 methodically establishing OJ Simpson's 1989 New Year's Day attack on Nicole Brown Simpson through testimony from a 911 dispatcher, two detectives, and Polaroid photographs of her injuries. OJ's own admissions to police—that he caused the beating—combined with his flight from the scene, painted a portrait of a man with a history of violence toward his ex-partner, establishing motive and pattern for the murder charges. The defense fought back aggressively, challenging the thoroughness of the 1989 investigation and the reliability of the evidence presented.

• 911 tape from January 1, 1989 played in court, capturing Nicole screaming and sounds of violence
• Detective Edwards testified Nicole emerged hysterical saying 'He's going to kill me' with visible injuries including cut lip, swollen eyes, and finger marks on her throat
• Three Polaroid photographs of Nicole's injuries were introduced; Edwards testified they didn't capture the full extent of the damage
• OJ admitted to pushing Nicole out of bed but fled the scene in his Bentley before arrest could be made
• OJ made an unprompted call to Detective Farrell admitting responsibility and expressing remorse
• Defense disclosed that prosecution witness Ron Shipp is Cochran's cousin, creating a conflict of interest OJ waived
• A 402 hearing began over whether Shipp's testimony about OJ's 'dreams about killing her' would be admissible