(CNN) -- Richard Strandlof said he survived the 9/11 attacks on the Pentagon. He said he survived again when a roadside bomb went off in Iraq, killing four fellow Marines. He'd point to his head and tell people he had a metal plate, collateral damage from the explosion.



Richard Strandlof says he didn't mean to cause harm when he lied about being a military veteran.



None of it was true. On Friday, the FBI arrested him on the rare charge of "stolen valor."



Strandlof, 32, was held "for false claims about receipt of military decorations or medals," an FBI news release said. Charges had been filed in Denver, Colorado, the week before, the bureau said.



"The penalty for his crime is up to one year incarceration and a $100,000 fine," it said.



Before his deception was revealed, crowds ate up his story. He canvassed Colorado appearing at the sides of politicians. Inspiring and seemingly authentic, he spoke on behalf of veterans at the state Capitol.



He formed a group called the Colorado Veterans Alliance.



The whole thing was a lie, he admitted to CNN's Anderson Cooper earlier this year.  Watch Strandlof discuss case in June. »



He wasn't at the Pentagon. He was never a Marine. He never served his country. He never graduated from the Naval Academy. He claimed his real name was Rick Duncan.



Where was he on 9/11, the day he said he witnessed heroism firsthand?



"I was in San Jose, California, watching it in horror on TV with a few other people," Strandlof told CNN.



He was at a homeless shelter at the time.



Strandlof denies being a pathological liar. He says he suffered from "some severely underdiagnosed mental illness" and he got caught up in the moment around "people who are passionate and loved what they did."



He told CNN he had put on a "production, which I'm sorry for."



"Hopefully the people that I hurt can in some way gain closure from that, and I myself don't know what I can do, short of leaving them alone and not being in their lives, to make that happen," Strandlof said.



He said he's not sure exactly how he's hurt people. "It's not for me to say, and time will tell," he said.



Hal Bidlack, a former Air Force lieutenant colonel, is one of those people. He ran for Congress as a Democrat and had Strandlof appear with him. Bidlack -- who lost to incumbent Republican Doug Lamborn -- isn't too happy.



"Once one lie fell apart, the whole series of things ... just cascaded into an ocean of lies," he said.



Bidlack was at the Pentagon when it came under attack on September 11, 2001. He now realizes that Strandlof stole portions of his own story.



"Now that we know he's a lying fraud," Bidlack said, "I think he was just parroting my own story back to me."



"There are an awful lot of things that he kept straight to try to fool an awful lot of people for an awful long time."



Doug Sterner has catalogued hundreds of people claiming to be military veterans who never served in the military. He says it's typical for those perpetuating the hoaxes to claim mental illness.



"I don't buy that," Sterner said. "What he was doing was looking for a cause to promote himself. I see this repeatedly. I've had a hundred cases just this year like Rick Strandlof's. ... What they're doing is building a kingdom of self and feeding their own ego."



Sterner has pushed for a federal database listing the names and citations of all decorated military veterans to help put an end to such cases. He said Strandlof has robbed true veterans of their veracity.



"Doing good does not take away from the bad that he did," he said. "Because of Rick Strandlof, the next
Who admitted he lied? Who formed Colorado Veterans Alliance? What was survived by Richsrd Strandlof? What is the fine for stolen valor? Who said he survived 9/11 Pentagon attack, Iraq bombing? What attacks did Strandlof claim he survived? When did he admit he lied? What is the penalty for stolen valor?
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question: Who admitted he lied?, answer: Richard Strandlof | question: Who formed Colorado Veterans Alliance?, answer: Richard Strandlof | question: What was survived by Richsrd Strandlof?, answer: the 9/11 attacks on the Pentagon. | question: What is the fine for stolen valor?, answer: $100,000 fine," | question: Who said he survived 9/11 Pentagon attack, Iraq bombing?, answer: Strandlof | question: What attacks did Strandlof claim he survived?, answer: 9/11 | question: When did he admit he lied?, answer: earlier this year. | question: What is the penalty for stolen valor?, answer: his crime is up to one year incarceration and a $100,000 fine,"