person that would just willy nilly go out for a walk. >> and they were very suspicious of this fact, cliff who was notoriously messy chose the day after sandi's disappearance to clean his apartment top to bottom. >> after she disappeared, he vacuumed the entire house, rented a carpet cleaner, cleaned the house, got rid of the vacuum bag. >> it turns out cliff reed had a bitter history with two exwives and police learned about allegations of a violent episode cliff reed had with an escort he hired two months. >> cliff reed was on top of her, strangling her, threatening to shoot her, groping her underneath her clothing. >> that case never went anywhere but raised red flags to the cops investigating sandi johnson's death. >> we realized, could this similar scenario have played