A Fox News guest terrorism analyst pleaded guilty on Friday to US charges that he fraudulently claimed to have been a CIA agent for decades, federal prosecutors said.Wayne Simmons, 62, of Annapolis, Maryland, entered the plea in US district court in Alexandria, Virginia, a Washington suburb, the US Attorney's Office said in a statement.The plea came in a hearing in which Simmons changed the not-guilty plea he had made in October."His fraud cost the government money, could have put American lives at risk, and was an insult to the real men and women of the intelligence community who provide tireless service to this country," said Dana Boente, the US Attorney for the Eastern District of Virginia.Simmons had appeared on Fox News, the top-ranked US cable television news network, as an unpaid guest analyst on terrorism since 2002.A grand jury indicted him in October for portraying himself as an "Outside Paramilitary Special Operations Officer" for the Central Intelligence Agency from 1973 to 2000.