Day 45 was dominated by Kato Kaelin's continuation of testimony, which deteriorated dramatically as Prosecutor Marcia Clark aggressively pursued the theory that OJ Simpson was consumed by jealousy over Nicole Brown and obsessively monitored their relationship. Clark methodically dismantled Kaelin's credibility, establishing that he had minimal direct contact with both parties and could not account for OJ's whereabouts during the critical 9:35-11:00 PM window on June 12th. Judge Ito declared Kaelin a hostile witness after he repeatedly contradicted his earlier statements, and the day ended with Shapiro and Clark escalating mutual accusations of improper conduct and witness intimidation.

• Judge Ito denied motion for sanctions but sustained prosecution's objection to improper questioning about 1989 domestic violence incident Kaelin could not have known about
• Marcia Clark systematically dismantled Kaelin's testimony that OJ was a devoted father, establishing only three to four hours of cumulative contact with his children over eighteen months
• Judge Ito declared Kato Kaelin a hostile witness after repeated contradictions between his trial testimony and prior grand jury statements
• Clark established that Kaelin cannot account for OJ's whereabouts during the critical 9:35-11:00 PM window on June 12th
• Kaelin admitted to discussing with OJ whether he could provide alibi testimony placing Simpson at home during the murder window
• Shapiro and Clark escalated mutual accusations of improper witness preparation, intimidation, and rude conduct, with judge breaking for the day