A 47-year mystery solved?

A Michigan man says he knew the infamous plane hijacker D.B. Cooper in a new memoir. ABC News' Diane Macedo reports.
2:10 | 05/18/18

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Transcript for A 47-year mystery solved?
Regret now with what could be a major break and one of the biggest on solve crimes in US history the identity of the infamous hijacker called. DB Cooper while it has eluded authorities for nearly half a century until possibly. Today. Here's a new investigation that claims to have cracked the 47 year old case another from Michigan says he knows who DB Cooper was and where he's been all these years. What would a notable like yeah. Right here at the site yet haven't got explosives. That's the voice of a man who is allegedly behind one of America's most infamous unsolved mysteries. So utility. I don't know the end kind of put it out of pocket like she's. I can't believe you're actually hijacking as Serb. And I and I can't believe could be careful about serious. Back in 1971. Men who claim to be Dan Cooper threatened to blow up a Northwest Airlines flight. He disappeared after jumping out of the plane over Oregon. With a parachute and 200000. Dollars in ransom money now 47 years later in a new memoir titled DB Cooper and me. A Michigan author claims he knew the infamous hijacker and two. He's dollars and maple I expect him and of being he'd be cool. He would not say yes to know right away but over the next eight years. Wolf and I had many phone calls slowly unravel this story of the hijacking. Karl Loren believes without a doubt that DB Cooper was actually a man named Walter Rica. Lawrence's Rica was his best friend and a former military paratrooper. In his memoir Lauren says Rico ultimately confessed to being DB Cooper releasing audio recordings he made of his friend allegedly giving details about the crime. Get money out to me took my belt always you will migrate to cope with the Korean fair curriculum but then. All the way up when that he had put the two huge gun you know. Falter Rica passed away in Michigan 2014 asked for the FBI's investigation it was suspended two years ago. The FBI will not confirm whether Walter Rico was ever suspect fascinating.

This transcript has been automatically generated and may not be 100% accurate.

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