Transcript for 2005 case against Michael Lee Jones leads to other assault cases: Part 11
Now remember, Michael Jones works for a company that sends him all over the country, he's never in one place for very long. You could say it's kind of a serial rapist's ideal job. This is a perfect gig for this guy. They pay you to move around the country, stay for a couple weeks, you work there and then you move on, you're somewhere else. What better occupation for a serial rapist to have. So when detective Foote tells Brennan that Jones copped a plea, a two-year sentence for his attack on Inna, Brennan is ready to play his final ace. Ken Brennan knew that he was dealing with a serial rapist and he was proved right. The FBI has a system called CODIS, which is a DNA database it's a central repository of all the records that police submit to the FBI. I said make sure you put his DNA into CODIS, and you'll see, there'll be other cases start popping up ��cause I'm sure this isn't this, you know, guy's first time. And once detectives enter Jones's DNA into that CODIS system, bingo. I was notified that they had DNA that had matched my case. Turns out detective Terry thrumston had a cold case up in Colorado Springs. At that time, Jones was working at the Colorado Springs world arena. He travelled all over the United States for his job, and he was good at being a rapist. The Colorado victim 41-year-old Jennifer Roessler, is seen here just minutes before the attack leaving a local convenience store. On that night her whole life changed. She was a woman, alone, walking at 2:30, 3:00 in the morning. The man asked her if she wanted a ride. She said, yes, and got in his vehicle. Got to her apartment, he asked for a drink of water. When I asked him, you know, you need to leave, you know, I was gonna go to bed, and he just, he was like, jekyll and Hyde. He just, it just, I could just see the, the monster come over him. And then he, he sexually assaults her at that point. Um, you know, he wasn't nervous. Um, he was calm. It was like we was on a date. And I knew, Terry, I knew this happened before. I've just, I had a feeling this has happened before, because he was too calm. She wanted to confront him. She wanted justice for what happened. I just want you to catch this guy. The DNA is incredibly powerful. But it still doesn't make this an open and shut case. The defense focuses on the fact that Jennifer let him into the house. And they claim that shows this was consensual. But thrumston refuses to let it go, and takes the case to trial anyway. I kept trying to get a hold of her, um, and couldn't get a hold of her. And I didn't find out 'til the beginning of December, that she had passed away. It was a shock. We had to figure out if we were even gonna be able to go forward without our victim being alive. I still wanted to go forward. Detective thrumston actually might have a DNA match to a case of another woman who might have been raped by Jones. Her story has a kind of familiar ring -- a stranger in a car, a ride -- and an attack. I screamed with everything I had. And the reality was, is just - there was nobody there. There was nobody there. This woman we're gonna call her Rachel might have been Jones's first victim. Rachel was the key to putting Michael Lee Jones in prison for the rest of his life. It was really Rachel who made a very convincing witness in court. I'm a working professional and I'm a mom. Rachel's been waiting years for this moment, to be able to tell her story as best she remembers it. Most importantly, to try to get justice. She was able to describe exactly what had happened to her six years later, in full detail of what had happened, without a doubt. At the time of the attack, Rachel helped create a composite sketch of the person who attacked her. And it looked a whole heck of a lot like Michael Lee Jones. Seeing that sketch next to his face, it was extremely satisfying. I just felt like, yes! But is that gonna be enough to sway a jury? Within a couple hours the jury came back and said he's guilty. Jones gets hit with a sentence of 24 years to life. And in 2015, a Louisiana judge slams him with an even bigger sentence -- 45 years, for the brutal attacks in the new Orleans area. You gave almost two years of your life to this case. How did it feel to finally see this guy brought to justice? I gave two years of my life investigatorial-wise. But, you know, the victims give a hell of a lot more. They're the ones that should be commended for this. I can only do the investigation and, you know, make an arrest, but they're the ones that put them in prison. The victims are the heroes here, they're the ones that have to get on the stand and say, this is what this guy did to me, this is when he did it, this is how he did it. And I feel happy that the criminal is where he's supposed to be, and he never gonna hurt nobody in the future. You need to go through this as painful and as traumatic and embarrassing as all of that might be, you have to do that because you just don't -- you never know how many other women may have been impacted by this person. Detective Foote has retired from the Miami Dade police department, and he's got a new opinion of private investigators, at least this one. You weren't that crazy about private eyes to begin with. Did this case change your mind at all? In respect to Ken Brennan, it did, yes. But private eyes in general, not so much? I still have the same opinion about private investigators. But I respect Ken Brennan, as a person and as an investigator. And I could count on him. Glad to know him. As for Inna she settled her suit against the hotel. And even though she was the key to helping solve so many other crimes, she doesn't really feel like a hero. She says she's just a survivor. I wish it never happened to any woman, I wish it never happened to nobody. I've been a reporter and a journalist for almost a half-century. And I think this is the most remarkable piece of detective work that I've ever come across. The sheer doggedss, the creativity, the cleverness that Ken Brennan brought to this case, make it truly extraordinary. And as for the man himself, Brennan -- with the case closed, he can treat himself to a celebratory cigar and a great sense of satisfaction. I've been doing this since 1975. And every one of the multitude of cases that I've done, this was by far the most rewarding. Jackpot
This transcript has been automatically generated and may not be 100% accurate.