Kellerman maintained his composure immediately after Kennedy's assassination, managing events as they continued to develop. Kellerman testified that he played a role in the autopsy at Bethesda, including guiding the doctors toward specific conclusions regarding bullet locations. Kellerman also took personal custody of the X-rays and photographic negatives at the conclusion of the autopsy and took them with him as he rode in the ambulance that transported the President's casket to the White House. When asked by the House Select Committee on Assassinations staff why he wanted this material, he said "...the point is, he was our man, everything belonged in the White House."