Here's a look at the US military's soldier-on-soldier attacks.
Fort Hood Shootings 2009
November 5, 2009: Army psychiatrist Maj. Nidal Hasan kills thirteen people, including an unborn baby. He also injures another 32 during a shooting spree at Fort Hood (now Fort Cavazos), a military base in Texas.
Hasan faces 13 counts of premeditated killing.
Hasan was charged on December 2, 2009 with 32 counts for attempted premeditated killing.
July 6, 2011: Lt. General Donald M. Campbell Jr. refers Hasan’s case to an all-court-martial, and rules that Hasan is eligible for death penalty.
Hasan was arraigned on July 20, 2011.
Col. Gregory Gross schedules Major Hasan’s hearing for June 8, 2012. Judge Gregory Gross makes the decision after Hasan appears in court wearing a beard in violation of military rules.
August 17, 2012: A military appeals Court halts indefinitely the murder trial against Hasan to determine if the Army is allowed to forcibly shave Hasan’s beard.
October 18, 2012: A military appeals tribunal rules that Hasan may be forced to shave, despite the fact that he claimed that his religion required him to wear a beard.
On November 19, 2012, the US government asked a military court of appeals to reject Hasan's beard request and to reject a defense motion to remove Col. Gross is the judge who will oversee the court-martial.
Col. Gross was removed as Hasan's judge at the court-martial because he was deemed biased. The judge's decision to order Hasan's facial hair to be shaved is invalid.
Hasan's case is reopened on December 4, 2012. Col. Tara Osborn has been appointed to the bench.
Col. Osborn decides that Hasan can represent himself in court. Hasan was paralyzed in the chest area after being shot on the day of his alleged murder of 13 people. He is only able to sit for a limited time.
Hasan's trial begins on August 6, 2013. Hasan says in his opening statement that the evidence will show clearly that I was the shooter.
August 23, 2013: A military jury convicts Hasan on 13 counts of murder as well as 32 counts of attempted killing, allowing the death penalty to become a possible punishment.
August 28, 2013: After less than 2 hours of private deliberation, the military jury recommends Hasan's death.
Hasan's conviction is upheld by the US Army Court of Criminal Appeals on December 11, 2020.
Timeline of other soldier on soldier attacks (Selected).
October 27, 1995: Sgt. William Kreutzer uses a sniper gun to kill one soldier at Fort Bragg in North Carolina (now Fort Liberty). In 1996, he is sentenced death. He is sentenced to life imprisonment in 2009.
Marine Sgt. Jessie A. Quintanilla kills Lt. Colonel Daniel W. Kidd and then shoots Lt. He is found guilty and sentenced to die. In 2010, his death sentence was reduced to life imprisonment.
Army Sgt. Hasan Akbar attacks the officers' tents in Camp Pennsylvania, Kuwait during the early days of the Iraq War with a rifle and explosives. Two officers die and 14 are injured. He is sentenced to die in April 2005. The US Army Court of Criminal Appeals confirmed Akbar's conviction on July 13, 2012. And the US Court of Appeals for the Armed Forces confirmed it on August 19, 2015 On October 3, 2016, the US Supreme Court declined to hear Akbar's case.
Joseph Bozicevich shoots and kills Staff Sgt. Staff Sgt. Darris D. Dawson and Sgt. Wesley Durbin, patrol base Jurf Sahkr in Iraq. Bozicevich was sentenced to life imprisonment without parole in August 2011 after being found guilty of 2 counts of murder.
May 11, 2009: Sgt. John M. Russell kills five soldiers at Camp Liberty, Baghdad in Iraq. Russell pleads to guilty in April 2013, and the prosecution drops the death penalty. In May 2013, he was sentenced to a life term in prison.
September 24, 2010 -- Spc. Neftaly platero kills two of his fellow soldiers at Camp Fallujah, Iraq and injures a third after a verbal argument. Platero was convicted in 2012 of killing Spc. John Carrillo Jr. Gebrah Noonan was sentenced to prison for life.