A military jury found Maj. Nidal Hasan guilty on all 45 charges in connection with the fatal shooting of 13 people at Texas' Fort Hood Army base in 2009.
Hasan, 42, faces the death penalty following the jury's verdict, which found him guilty on 13 counts of premeditated murder and 32 counts of attempted premeditated murder.
The major was accused of killing 12 soldiers and a civilian, and of wounding 12 people when he opened fire indiscriminately at Fort Hood on Nov. 5, 2009.
The accused, who had worked as a psychiatrist on the base, acted as his own defense attorney in the trial and declared himself guilty as soon as proceedings began on Aug. 6.
The jury, made up of 13 high-ranking military, deliberated almost seven hours before reaching a unanimous verdict.
From the beginning the federal government has urged the death penalty for Hasan, who at no time denied responsibility for the massacre.
During a hearing in June before the trial began, Hasan, a U.S.-born Muslim, said he launched the attack to protect the Taliban leadership in Afghanistan, and in particular its leader, Mullah Omar.
The jury must now decide whether to sentence Hasan to death, which requires a unanimous vote.
In recent years, many death sentences for military personnel have been commuted to life sentences without the possibilty of parole.
Hasan attended several hearings during the trial in a wheelchair, having been paralyzed from the waist down in the shootout. EFE