Maj. Nidal Malik Hasan , the alleged Fort Hood gunman and a psychiatrist who worked in a hospital at the base , is blamed for the deaths of 12 soldiers and one Army civilian employee , and for wounding at least 38 others . If convicted , Hasan will join an infamous list of Americans who have committed acts of mass murder . Since 2005 , there have been at least 11 other incidents where gunmen have opened fire on groups of victims .
Since then , Hasan had been unable to leave the military , a military spokeswoman said . She said he told his family he had been shot after the terrorist attacks in 2001 . The military officer who shot Hasan , during the massacre , was among the wounded .