Washington ? Valerie Plame, the CIA officer whose exposure led to a criminal investigation of the Bush White House, spent her last day at the spy agency Friday.

Neither the agency nor Plame’s husband would confirm her departure, but two people who have known Plame for a number of years confirmed she was leaving.

Married to Bush administration critic and former U.S. Ambassador Joseph Wilson, Plame was working at agency headquarters in Langley, Va., in 2003 when her CIA status was disclosed by conservative columnist Robert Novak. That triggered a probe that led to the recent indictment of Vice President Dick Cheney’s chief of staff, I. Lewis Libby.

Plame was an employee in the CIA’s Counterproliferation Division.

Plame’s CIA connection was disclosed days after her husband accused the Bush administration of twisting prewar intelligence to exaggerate the Iraqi threat.