julie estes' killer, investigators were convinced they'd found him. he was serving time in prison for a similar crime committed 30 miles away. his name was james elmen. >> elmen was the worst of the worst. we talk about he's the poster child of antisocial. it's a clue when the public defenders are afraid of him, when the doctors are afraid of him, when the people at the medical treatment facility are afraid of him. >> i was convinced if james elmen hit the streets of jacksonville again, women were going to start dying again, and i wanted to make sure that those cold case detectives had everything that they had to make sure that we could make the case. >> but investigators wanted to be sure elmen was responsible for julie estes' murder. why? because if he wasn't, julie's killer was still on the loose.