After shots rang out Wednesday at Ft. Hood, Americans' memories flashed back to Nov. 5, 2009, when Army
That remains the deadliest mass shooting on a military base in the U.S.
Wednesday's incident left at least four dead, including the gunman, officials said, and several were wounded.
Witnesses said Hasan shouted "God is great" in Arabic before he started shooting.
In opening arguments, Hasan said he had a duty to kill fellow soldiers to save fellow Muslims, admitting to the court that he opened fire because his religious convictions had led him to switch sides and take U.S. lives. He declined to testify, however, or to submit much evidence.
By contrast, prosecutors called nearly 90 witnesses and submitted more than 700 pieces of evidence.
Years before his sentence, Hasan had told a military mental health panel that being executed would make him a martyr. But during closing arguments, a military prosecutor insisted that a death sentence was not martyrdom.
"He is not now and will never be a martyr," said the prosecutor, Col. Michael Mulligan. "Do not be fooled. He is not giving his life -- we are taking his life. This is not his gift to God. He is a criminal -- a cold-blooded murderer."