Ex-NASA chief Sean O'Keefe believed to be on board a small plane that crashed in Alaska

Ex-NASA chief Sean O'Keefe, seen in this February 12, 2004 file photo in Washington, was on board a small plane that crashed on August 9, 2010 in rural Dillinham, Alaska. Sen. Ted Stevens (R-AK) was also believed to be onboard the aircraft and it is unknown if there are any survivors. UPI/Michael Kleinfeld/File