Dr. Robert Huizenga testified for the defense about Simpson's physical ailments and his June 15-17 examinations. Brian Kelberg's cross-examination questioned Huizenga's qualifications and documentation, including the absence of the 'Tarzan's grandfather' observation from his report. Huizenga answered a hypothetical that none of the findings in item 1 showed a physical limitation that would have prevented the described acts; he also qualified the laboratory results and wound-healing testimony discussed in cross-examination.

• Dr. Huizenga testified that Simpson had severe arthritis and mobility issues and that his June 15 examination found no bruising, scratches, or acute injuries except cuts on his left hand
• Prosecutor Kelberg attacked Huizenga's qualifications, noting that he had no post-residency rheumatology training and no residency training in orthopedics
• Kelberg exposed that Huizenga's 'Tarzan's grandfather' observation was never documented in his formal report despite calling it significant
• Huizenga testified that he considered the possibility Simpson had a motive to lie regarding his symptoms
• Huizenga answered a hypothetical that none of the findings listed in item 1 showed a physical limitation that would have prevented the described acts.
• Cross-examination attacked the completeness of Huizenga's orthopedic examination and used lab results to undermine his conclusions