OJ was a suspect from the top. With a crime like that the ppl closest to the victims are always suspected first. OJ was Nicole's ex husband and they had a history of violence. He was the first suspect. From the hours the bodies were discovered he was the suspect unless/until he was ruled out. He was never ruled out in part bc of what the police allegedly learned about his movements in the hours b4 they believed the murders happened. To wit - the police took a blood sample from OJ the day after the murders. That means they were investigating him the day after the murders. He was at least a person of interest.