1: Levinson , a retired FBI agent , vanished after traveling to the Iranian island of Kish in March 2007 and is one of the longest-held U.S . citizens in history . 2: Iran 's government repeatedly has said it is not holding Levinson and does not know his whereabouts . 3: Levinson , a former FBI agent , went missing in Iran eight years ago ; Iran says it does not know where he is .
1: Levinson , a retired FBI agent 2: Levinson 3: Levinson , a former FBI agent