During the two-day murder trial, a pathologist testified that blood found on Roseboro's clothes was type "A," which matched Mrs. Williams's blood type. Roseboro denied killing Mrs. Williams, saying that police lied about the investigation and that he would have had no motive for the murder because there had been no rape or robbery. He drew maps of where he was in the building when police arrived and explained how Mrs. Williams's blood had gotten onto his clothes.