Next tonight, an accused impostor, who reportedly lured investors by pretending to be a navy s.E.A.L., Abc's matt gutman decided to investigate. Clear, come around and shoot. Reporter: As a.J. Dicken... See More
Next tonight, an accused impostor, who reportedly lured investors by pretending to be a navy s.E.A.L., Abc's matt gutman decided to investigate. Clear, come around and shoot. Reporter: As a.J. Dicken liked to tell people, he wasn't just any old navy s.E.A.L. He claimed to be the most decorated navy s.E.A.L. In history, even says he fired the kill shot on osama bin laden he ran a military style self defense school. Carol roberts was his student. What was your first impression of him? Big guy, he commands authority by his size. Reporter: But dicken told carol, he'd set his sights on something bigger. An international security firm and convinced a pair of local doctors to invest $850,000 in his company. He said, I'm ex-navy s.E.A.L., Then I went into the cia after I retired from the S.E.A.L.s. Reporter: Business was taking off so he hired carol. You actually quit a good job in order to work with dicken, because you thought the money was coming in. Yes. Because I had seen the contracts. Reporter: A $500 million contract to do security in africa. On paper at least. Suspicious of his story she asks a real navy s.E.A.L. Don shipley about dicken. Shipley has access to the restricted s.E.A.L. Database and exposes dicken as a fraud. How many guys have you exposed? Thousands. Reporter: Thousands. Yeah. I verify on average at least 20 fraudulent s.E.A.L. Claims a day. Reporter: Turns out he wasn't the guy who killed bin laden but a former bartender with a rap sheet who never served a day in the military. It was all a great big fraud. Reporter: Outed dicken disappears, months later we track him down in arkansas. How you doing, mr. Dicken. I have nothing to say to you. Reporter: Folks in the navy s.E.A.L. Community say you're not a commando you're a con artist. I have nothing to say. Reporter: His investors say they want their money, and nevada wants dicken for felony weapons charges. Matt gutman, abc news, miami.
This transcript has been automatically generated and may not be 100% accurate.