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Previously, in episode four of WTOP's American Nightmare series, Unknown Subject.

When you get a murder that's like this, and you have not much of anything to go on, you do a lot of wheel spinning.

Back in the early days of DNA, it took so long, I mean, to get your result.

Code has notified Montgomery County that there was a match to like eight rapes that they had up there.

And so, you know, I contacted Joe Medano. Do you recall getting the notification that the

Merzion murder was connected to your rape cases? Yeah, yeah, I do. And I was like shocked.

It's a Thursday in June in 2012, six months after the FBI joined the search for a serial predator.

They were now calling the Potomac River Rapist.

Reporters in Washington, D.C., were told for the first time in years that D.C. police had new information in the case.

We were told to meet the police chief not at

police headquarters, but on MacArthur Boulevard, a leafy street in an upscale section of the city

near the German embassy, and about a mile from Canal Road, where Christine Rizion was killed.

When I arrived, I recognized a number of high-ranking police officials,

including the two detectives assigned to the case, Todd Williams and Tony Brigadini, as well as

Montgomery County Police Detective Joe Madano. I was also surprised to see John Walsh there.

I knew the host of America's Most Wanted had profiled the case before, and I was anxious to hear

...