He didn't confess right away. Instead, he smiled in court. So, for a long time, no one knew where his wife was. But then he offered police a deal. In exchange for a lighter punishment, this husband agreed to walk detectives into the woods and point to the exact spot where he had hidden his wife's body, turning the final resting place of the woman he once loved into a bargaining chip. In May 2016, Steven Williams entered a plea of no contest to second-degree murder. In exchange, prosecutors agreed to a 35-year prison sentence. This agreement was widely described as a deal with the devil. Under police supervision, Steven Williams walked investigators into the secluded area. He stopped, looked down, and planted the flag he was given to identify the spot. This was the moment everything changed. >> Yeah, it's going to be a plastic barrel. >> Plastic barrel, okay. And exactly what type of chemical fluid are we talking about for safety >> An acid, yeah. >> Sulfuric acid or hydrochloric? >> Hydrochloric.