| Military Career | | Allegiance | United States (until 2009) |
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| Branch | United States Army Medical Corps (until 2009) |
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| Service Years | 1988-2009 (dismissal) |
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| Rank | Major (revoked) |
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| Timeline | - 1988: Joined the United States Army
- 1997: Entered the Uniformed Services University of the Health Sciences in Bethesda, Maryland
- 2003: Received his medical degree and began specialist training in psychiatry at Walter Reed Army Medical Center in Washington, DC
- 2009: Transferred to Fort Hood, Texas, one of the largest US Army bases
- 17/05/2009: Promoted from Captain to Major
- July 2009: Transferred to Darnall Army Medical Center at Fort Hood and moved to Killeen, Texas
- July 2009: Legally bought an FN Five-seveN handgun about two weeks after moving to Killeen
- 05/11/2009: Carried out the Fort Hood shooting at the Soldier Readiness Processing Center, killing 13 people and injuring 32 others
- Shot by military police and left paralysed from the chest down; later used a wheelchair
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| Work Details | - Treated military personnel with mental health problems at Walter Reed Army Medical Center
- Studied the effects of trauma on soldiers
- Worked at the Center for the Study of Traumatic Stress
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| Investigations | - The Army Criminal Investigation Division started a criminal investigation with the help of the FBI and other agencies
- The FBI investigated his communications with Anwar al-Awlaki in 2008 but concluded they could be connected to his professional research
- The William H. Webster Commission found problems with FBI policies, technology, information review procedures, and training
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| Trial and Sentence | - Faced a court-martial at Fort Hood in 2013, which lasted 22 days
- 23/08/2013: Found guilty of 13 counts of premeditated murder and 32 counts of attempted premeditated murder
- 28/08/2013: Sentenced to death
- Dismissed from the Army and ordered to give up military pay and allowances
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| Appeals and Execution | - March 2024: The United States Court of Appeals for the Armed Forces upheld his conviction and death sentence
- 31/03/2025: The US Supreme Court refused to review his case
- 02/10/2026: Donald Trump, President of the United States, approved the death sentence
- 06/10/2026: Acting Secretary of the Army Adam Telle directed execution by firing squad at Fort Hood, Texas, at 1 p.m. Central Time on 03/12/2026
- He was being held at the United States Disciplinary Barracks at Fort Leavenworth, Kansas
- October 2026: The Pentagon announced plans to livestream the execution, which sparked public debate
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