michelle kramer: i don't think that he would destroy himself., the bravado of saying, i-- you're not gonna take me alive. i think he knew exactly how to kill himself if he wanted to. reporter: two months later, weinberger was extradited to the united states. back in indiana, he faced hundreds of lawsuits and 22 federal charges of health care fraud that could land him in prison for up to 10 years. but weinberger cut a deal and agreed to plead guilty if he was given four years in prison. you look at the agreement. what do you think of that agreement? ken allen: well, i can't say that on television. the original agreement that the us attorney put out there was crazy. i mean, this is nuts. reporter: the judge agreed and intervened. fortunately, the judge was brave enough, smart enough, man enough to throw it out and tell him, he's gonna have to do time. reporter: that meant weinberger's criminal case could go to trial. and the hundreds of civil lawsuits against him marched forward, too, one of them by a woman who likely triggered weinberger's five-y

michelle kramer: if it's able to help young women avoid something like this happening to themselves or make them realize, you know, it doesn't make you stupid, it doesn't mean that your life is destroyed, then maybe it all happened for a reason. and you are stronger than ever before. i definitely feel like i'm a resilient and strong person now, yes. [wind howling] you ever contemplating committing the perfect murder? and he said, yes. the key element to that is making sure that someone is caught. once they have somebody, they'll stop looking, and that's how you can get away. craig melvin: a cold-blooded killing, a victim worth millions, and all kinds of conflicting clues. i've never had a case this complicated before. craig melvin: police following multiple leads until-- dean carriger: we asked, who's that? and he says, he's my neighbor who lives two floors below. craig melvin: a suspect under arrest. having someone you love just taken away. sorry. craig melvin: case closed-- or was it? could there be something else or someone else they missed? there were so many parts of the puzzle th